Banned from a subreddit for participating in another subreddit

Reddit suggested a thread to me in my feed. I replied to it and was immediately automatically banned because I was a member of another subreddit.

Does this violate Reddit's rules as a platform?

In any case, it's degrading my user experience because I didn't search for this group or thread; Reddit suggested it to me. I spent time responding, and they robbed me of that time without giving me the chance to express my opinion.

Does this violate Reddit's moderation guidelines, and is there any way to take action against this subreddit and its moderators?