Hello @crypto.piotr

What would you say about an idea to build some blacklist and ensure that users who would end up on this blacklist wouldn't be able to upvote (their upvote wouldn't provide any rewards and it's value would be zero).

Where i said this? I don't want any blacklist and also don't want to upvote value zero for that type of account. I never says that. I don't understand from where you conclude this.

I just say that voting power should be same for upvote/downvote, No different voting power for upvote and downvote. It means no free downvotes, like we have earlier.