Sounds like an odd request, and not sure if this even belongs in gaming but glibc2.39-1 and whatever copy of lib32-glibc breaks use of certain EasyAntiCheat-equipped games.
I noticed you already have someone posting a PSA about it, but is there consideration for the next EndeavourOS release to compile and have the packages from glibc-eac repo available in endeavouros repo and default in new installations? It takes a considerably long time to build and for some the broken EAC thing might be a bridge too far for prospective users looking at EndeavourOS as an option, and you would be able to get the jump on Manjaro before they consider doing this for their distribution.
why put effort in something that will be fixed anyway?
EAC is only useful in online games, and they need to be maintained/updated or they are already dead. EAC has to fix their stuff, game devs include it in their next update and after that it will work again.