Rockstar has been in a constant battle against cheaters in Grand Theft Auto Online ever since the game was initially released. While the PlayStation 4 and Xbox One are relatively clean now thanks to the suspension of character transfers, hackers and cheaters still appear on PC. Rockstar hasn't ever been lenient with hackers, and that hasn't changed.
This new clarification of GTA Online cheating policies was likely triggered by the upcoming release of Red Dead Redemption 2 on PC, which includes the game's multiplayer mode Red Dead Online. RDR2 has already been available on the Xbox One and PS4 for a year, and cheating on these platforms is next to non-existent, however the PC is a much more vulnerable platform.

A number of new support articles published by Rockstar give players an overview of what actions warrant either suspension or a complete ban. These are the same criteria used by Rockstar itself when dishing out these punishments, so it doesn't hurt to be familiar with them. The offending actions are as follows: