After months of playing MW and Black Ops, one day I queue up with friends and after waiting 5+ minutes no server would be found. We try over and over finally we realize its me.
Googling around shows that I am "Shadow Banned" and everyone is like "go away cheater" online.
I've been playing online games with an in game name that contains the word "Erotica" for a while now (4+ years) and have had zero issues.
Turns out the word "Erotica" is BANNED by Activision, and they synced their identity management with Blizzard it got flagged.
I found ONE random thread on Reddit where a guy ran into the same problem and gave a link to directly log into their system.
Once logged in I got "Your username contains adult content and must be changed".
After changing it, and waiting 3 days, it 'synced' and my account was unbanned.
The whole thing was absolutely stupid, I had paid $60 and could not play any of their games.
It pretty much ruined the game for me, I haven't given them a dollar since.