1. It's impossible to create a paid account with cryptocurrency: You can only use it to pay for an existing account
2. It's impossible to anonymously create any account over Tor: You have to at least pass SMS / secondary email verification, and it better not be an easy to get address ("Email verification temporarily disabled for this email domain" etc.)
Lots of marketing and boxticking (.onion: check), but it looks curiously hostile to anonymity if you actually try to use it.