The reason they were banned on leetx is because they sold out their user email lists to an anti-piracy law firm which tried to extort money from people. I wouldn’t trust people like that. I especially would be wary of subjecting users to people like that. Torrent freak has coverage if you care to search.
They can block specific communities.
Previously there was this whole thing over lemmy world admins banning their piracy community so I would not be surprised if they were blocking certain dbzero communities as well out of their extremely cautious and risk averse nature.