Rockstar can ban you at random; I have been a loyal GTA Online player for almost 10 years, since the game got released. I have bought the game multiple times, on PC, Playstation, for family members, etc. I have NEVER ONCE modded or even played with modders as I always play by myself, and yet I still got banned.
What happens if I try to contact Rockstar Support?
First of all, it's almost impossible to get in touch with them to begin with as they desperately try to avoid giving you the chance to send a ticket - instead, they will attempt giving you "related articles" that do not help at all.
Secondly, if you do get in contact with Rockstar, you are almost guaranteed to never get a response from an actual human. It is only auto generated responses over and over and over again.
And if you get banned even by a badly working anti-cheat system, they still won't unban you because "their decision is final".
Worst company I have ever been in contact with; they don't care at all about their customers, not even those who have played their games for thousands of hours, grinding and having fun.
I am never again going to buy a Rockstar game, and everyone I know will be advised the same. Make sure you don't waste your money on shark cards ingame either; they'll still ban you and not care.