Lots of Flathub requests!

Hi !
I’m quite a fan of Flatpak and am using several packages:

[me@ordi1 ~]$ flatpak list
Name                                              Application ID                                  Version                  Branch           Origin            Installation
Vorta                                             com.borgbase.Vorta                              v0.7.1                   stable           flathub           system
Dropbox                                           com.dropbox.Client                              112.4.321                stable           flathub           system
Ferdi                                             com.getferdi.Ferdi                              5.5.0                    stable           flathub           system
Curtail                                           com.github.huluti.Curtail                       1.0.0                    stable           flathub           system
Dessin                                            com.github.maoschanz.drawing                    0.6.4                    stable           flathub           system
Mark Text                                         com.github.marktext.marktext                    0.16.2                   stable           flathub           system
Spice-Up                                          com.github.philip_scott.spice-up                1.8.2                    stable           flathub           system
Flatseal                                          com.github.tchx84.Flatseal                      1.6.5                    stable           flathub           system
Skype                                             com.skype.Client                                8.67.0.96                stable           flathub           system
Shortwave                                         de.haeckerfelix.Shortwave                       1.1.1                    stable           flathub           system
Nuvola Player Service                             eu.tiliado.Nuvola                                                        stable           nuvola            system
Qalculate! (GTK+ UI)                              io.github.Qalculate                             3.15.0                   stable           flathub           system
ghostwriter                                       io.github.wereturtle.ghostwriter                1.8.0                    stable           flathub           system
Master PDF Editor                                 net.codeindustry.MasterPDFEditor                5.6.80                   stable           flathub           system
Freedesktop Platform                              org.freedesktop.Platform                        19.08.12                 19.08            flathub           system
Freedesktop Platform                              org.freedesktop.Platform                        20.08.2                  20.08            flathub           system
default                                           org.freedesktop.Platform.GL.default                                      19.08            flathub           system
default                                           org.freedesktop.Platform.GL.default                                      20.08            flathub           system
Intel                                             org.freedesktop.Platform.VAAPI.Intel                                     18.08            flathub           system
Intel                                             org.freedesktop.Platform.VAAPI.Intel                                     19.08            flathub           system
Intel                                             org.freedesktop.Platform.VAAPI.Intel                                     20.08            flathub           system
html5-codecs                                      org.freedesktop.Platform.html5-codecs                                    18.08            flathub           system
openh264                                          org.freedesktop.Platform.openh264               2.1.0                    2.0              flathub           system
GNOME Application Platform version 3.36           org.gnome.Platform                                                       3.36             flathub           system
GNOME Application Platform version 3.38           org.gnome.Platform                                                       3.38             flathub           system
Apostrophe                                        org.gnome.gitlab.somas.Apostrophe               2.2.0.3                  stable           flathub           system
Adwaita theme                                     org.kde.KStyle.Adwaita                                                   5.14             flathub           system
Adwaita theme                                     org.kde.KStyle.Adwaita                                                   5.15             flathub           system
KDE Application Platform                          org.kde.Platform                                                         5.12             flathub           system
KDE Application Platform                          org.kde.Platform                                                         5.14             flathub           system
KDE Application Platform                          org.kde.Platform                                                         5.15             flathub           system
Krita                                             org.kde.krita                                   4.4.1                    stable           flathub           system
Zoom                                              us.zoom.Zoom                                    5.4.57450.1220           stable           flathub           system
i2pd                                              website.i2pd.i2pd                               2.35.0                   stable           flathub           system
[me@ordi1 ~]$ 

One of those I use all the time is Shortwave.

I also use NextDNS to avoid my ISP’s lying DNS ^^ and to have a pi-hole like first level of protection.

My issue is that NexDNS shows me a tremendous number of Flathub requests:

Capture d’écran_2020-12-23_10-53-55

This is puzzling !
What could be the origin of this ?

Indeed, my question is : is there tracking on Flathub ?

If yes, which & why ?
If no, why does my system show more Flathub connections thant Google connections ?
In any case what info would be needed to inquire ?