There was at least one other case:
Is stingers still a merit source?
Not anymore. That's clear abuse, awarding merit for political reasons rather than any idea of quality. Only because he was a source, I effectively undid those merit sends. If he had not been a merit source, I still would've blacklisted anyone who got into DT1 through that type of shenanigans.
Meriting predominantly your own shitcoin and a known scammer/troll with source merits seems about as bad as "political reasons" since it's not really about post quality.