We don't have the full contents of Rockstar's cease and desist yet. Rockstar's Statement, Developer's Response Hobbies are being destroyed peoples' hard work is being demonized, and an art form is dying. No one knows why it decided to suddenly outlaw modding of GTA V, and there's a commonly held sentiment that Take-Two has no idea how many of its players the ban is affecting.
Most of the negative feedback is stemming from a lack of communication on Take-Two's part. This isn't about preventing would-be customers from buying the game and giving Take-Two more money, it's about sending a message. Take-Two made more than enough money on GTA V on opening day, and the game has continued to sell incredibly well since then on every platform. To be clear, this isn't going to hurt anyone's feelings. In an instant, fan-reception transformed from generally very positive, to outright hostile. But for one reason or another, Take-Two (who owns Rockstar) decided to shut it all down, and fans are lashing out by bombarding the game with overwhelmingly negative reviews on Steam. Players have been modding GTA games since Grand Theft Auto III. For years, an enormously popular modding tool called OpenIV has enabled passionate players and content creators to mod game files and do incredible things with GTA V and GTA IV.
Grand Theft Auto V players are pretty pissed off right now.
