Github provides the "issue tracker" side of things. But I'm not aware of any "sign up to pay this developer $X/month" functionality?
Patreon, I guess? You mention it, but not really why it wouldn't work at small scale. At large scale, you'd need to build something to link Bugzilla and Patreon users.
I can imagine wanting to self-host, but I'm not sure that giving up the established (if expensive) Patreon platform would be worth it.
(EDIT: comment has been expanded twice; sorry.)
Did you read the blog post? I specifically described this as a cross between Patreon and Bugzilla.
A fair response; sorry, I expanded the comment to something more reasonable.