Hacker News Reader

Give it time and there will be private servers for the modded client

There are already private servers. There are whole communities built up around role playing in bootleg GTA 5 servers.

Rockstar bought the developers of the private server software out and integrated them into their teams, presumably for GTA 6.

For context, one of these is FiveM[0], which is very popular (and if anything, a lot better than the official Online in many ways.)