I don't recall every to see a post on HN that Microsoft has terminated access to some ones MS (Business) Account. I am sure someone has got their account terminated I just don't recall ever seeing a post about here.
we have seen plenty for google, Amazon, Facebook. I see no reason to think Microsoft is different. Just because we haven't heard of a case yet, doesn't mean it is not possible or that it will never happen. it's more likely just a matter of time.