This thread....
They didn't remove mods.
Take Two Interactive sent a cease and desist letter to OpenIV which is a program used for accessing the games files and overall making modding easier without screwing up your game.
OpenIV is used for single player mods and does not affect multiplayer at all, Take Two came up with a bullshit excuse that OpenIV was allowing people to cheat in GTA Online which is bullshit. OpenIV has been around for over 10 years and it's a shame that they are no longer running the program and providing updates. #FuckTakeTwo