why are some Yahoo answers accounts suspended?

I just noticed a regular poster has had his account suspended - i clicked on his profile - and found he's been suspended - and, as far ad i know, he's been a decent guy

13Across2014-09-16T07:51:03Z

An account should only be suspended for a very serious offence; essentially for breach of the Terms of Service. You may be seeing the "false gulp" glitch. Try refreshing the tab, or reloading the profile in a new one. If mousing over the avatar picture by one of that user's posts shows account information, he or she has not been suspended.

There are two other similar glitches: "false drop", when a question shows as deleted but hasn't been; and "false private", when an account with open activity shows as private.