Slippery slope to what? In-game chat and even chat apps like discord aren’t public forums, you’re held to the rules set by the company providing the services. If you can’t abide by the rules they set, they reserve the right to remove you and revoke your access. Their goal is to provide an appealing service to the widest audience possible not cater to a bunch of toxic folks who can’t mind their temper.

If you can’t contain yourself, or at the very least mute yourself and you get banned that’s on you.