blocking specific user prevents them from contacting you (private message)
but it does not prevent user to post in your topics.
i am offering this idea to the admins, so that useless ppl cannot hassle

they have something like this out so you don't see anything they type

you won't ever see a day where you can completely block someone from posting in a thread

This has been asked so many times over the years.
A scammer can just block people after scamming so it doesn't work.

Poor scammer being hassled