UT99 is already managed by the community, so it'll be fine. They'd need to update some master server list possibly, but I don't think that's impossible.
I wonder if this opens up some interesting opportunities though. Supposedly some members of the community have sufficient access to source code to issue (unofficial?) patches, but were instructed by Epic to only make changes that don't break vanilla, out-of-the-box UT99 - I guess so that you could buy the game on GoG and start playing using the official servers. If they're cutting it loose, this might free the community up to make some changes they've been keen to do - for example apparently the netcode is pretty janky but has been off-limits so far.
Will need to pester my friend who knows about this better than me, but in short: UT99 isn't going away any time soon.
I wonder if this opens up some interesting opportunities though. Supposedly some members of the community have sufficient access to source code to issue (unofficial?) patches, but were instructed by Epic to only make changes that don't break vanilla, out-of-the-box UT99 - I guess so that you could buy the game on GoG and start playing using the official servers. If they're cutting it loose, this might free the community up to make some changes they've been keen to do - for example apparently the netcode is pretty janky but has been off-limits so far.
Will need to pester my friend who knows about this better than me, but in short: UT99 isn't going away any time soon.