Also from what I understand, the service can be used for stealing, hence may be seen as an illegal tool. And illegal stuff is against the rules, this would be my take for the reason of deletion.
Then thread about unknown mixer, exchange and custodial wallet should be removed as well since it could be used for stealing.
From what I know, there's no PM on removal of topics. Only for posts.
That would be my guess too. I've never had one of mine removed, but I do know users don't receive a PM if a topic they posted in gets removed. It might be the same for whoever created the topic.
I didn't know that, but it's weird bitcointalk bother to send PM only for removed post.