Sadly, some malicious users sought to use the tool to cheat and harm other players, which is what prompted Take-Two to take legal action.
Take Two Interactive recently took the surprising step to ban certain modifications in GTA V, most notably, OpenIV, which made many different other mods possible with its low-level game tweaking and the fall out has been huge.
If you haven't been following the uproar that has engulfed the Grand Theft Auto 5 since Take-Two issued a cease-and-desist to popular modding tool OpenIV, here's the short version: People are pissed.
Grand Theft Auto 5 publisher Take-Two Interactive has found itself in the crossfire after sending a cease and desist letter to the lead developer of popular modding software OpenIV. At the time of writing over 39,000 reviews have been submitted recently, with majority being classed as "Overwhelmingly Negative". "All modding used by OpenIV is for singleplayer use only to make the game more enjoyable, the software OpenIV was never used to mod multiplayer or Grand Theft Auto Online so it does not harm anyone".
In addition to the negative reviews on Steam and cries of outrage online, fans of the OpenIV modding tool have amassed over 40,000 signatures on their Change.org petition. We are working to figure out how we can continue to support the creative community without negatively impacting our players. The developers said they do not have the time or energy to fight the claims in court. The petition has now garnered over 50,000 signatures. And for quite some time both Rockstar and Take-Two the game's publisher excepted and embraced this. But Take-Two is also going after specific cheating services (via Kotaku UK). Over 38,000 negative Steam reviews of GTA 5 have now appeared in the past few days, dropping its "recent" review score to "Overwhelmingly Negative".
We've requested comment from Take-Two about this controversy and will update as we hear more.