Just when Rockstar started cracking down on these, someone made a Co-op mod for GTA V.

Something many gamers have been missing from GTA Online is a proper co-operative game mode. The closest thing players have gotten is a set of team-based modes. However, there has been no PvE multiplayer option for players to share with their friends. In addition, the other GTA V multiplayer alternatives out there offering players some more freedom, such as modded servers and custom (not "content creator custom" but real custom) game modes and tweaks are being shut down one by one after Rockstar (check out the links for the reasons why).