You are saying this under the impression that Blizzard's employees are omnipresent and omniscient. The ticket waiting time on my realm is currently 6 days, the GMs are already working at full speed while at the same time trying to be polite and keep up with all their work at a basic wage, and Blizzard is losing customers faster than a bag of sand with a hole at the bottom.
When you screenshot something and share it with the world it's usually something you feel like sharing, something different: a new transmo, an achievement, a bug, a cheat, a hack. They are not doing this to track your latest hairdo but to make sure that, even if you erase your character's name and chat, they will still be able to track the origin of the event you are showing off and THEN check their logs to see what happened and how they can fix it.
It's not paranoia, it's business thinking.