I finally got to a staff member on their IRC.

My account was disabled because I was invited by a member of this website. No rules broke, just their policy to blacklist Torrentinvites...

To join UHDBits, you have to be friend with a member, but you can't meet this member on a community website like this one... Anyway, not wasting more of my time, I disagree with this policy.

To anyone which account was disabled, it's because they found of that you were invited here. As simple as that.