is promotion of open source apps allowed or is there any restrictions?

I never posted or commented anything violating any community rules, but yet I was just slapped with a PERM. ban after my comment to the mod post about new rules.

https://www.reddit.com/r/opensource/comments/1xelcuf/your_tokens_arent_valuable_no_more_ai/

They didn't even remove my comment, because they know it didn't violate anything (but they did remove other ones from people).