Exclude currently means EOL-ing them. I think in cases where maintainer deleted their GitHub account, the upstream repo was archived, maintainer stated it should be EOL-ed or if it hasn’t been touched in 5-6 years/uses a super old runtime - it should be fine to EOL them.
Although I doubt you can get apps on a super old runtime like GNOME 3.xy to build currently. We have to EOL them from the server if they are not buildable.