It is, bu it's on a case by case as far as I know.
People have been permanent banned and have written a bunch of different excuses and reasons across a bunch of different times. Some people appeal immediately and get unbanned while others have to wait a few years before they get unbanned. Some have written that they're sorry and they were a kid and apologized and had their accounts banned while others said they were hacked and other stuff and got unbanned.
Of course, there are a ton of other cases where the appeals were denied, so don't get your hopes up.