I know Privacy [0] is one possible alternative, but it's debit based rather than credit based like Final is, and they require linking a bank account by username and password, which AFAIK makes you entirely liable for any fraudulent activity for the account, so that's a non-starter for me. Anyone aware of any other services that provide virtual cards like these?
EDIT: just found out about Token [1], which seems similar. But the fact that it makes you enter your phone number to get a link to the app seems rather shady... I can't seem to find their app on the Play Store so I'm going to assume they're iOS only and skip it. Can anyone comment on their experience with the service?