Repeatedly violating the terms of service is the most common one we notice, as the violator will interact with us in threads then *poof* banhammer.
However i'd bet a more common one is spam, since those are both instantly banned and the ones where the threads are actually deleted. We don't see or notice for the deletion, and its also the only instance I've ever heard or seen of mods deleting stuff on the forum proper (as opposed to say, blogs).
It is also ridiculously unlikely you or anyone else will get banned without a looooooooooot of forewarning.
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