⁉️ Does money betting need Vault?

#Answer

Yes. Money betting needs Vault together with an economy plugin.

Without Vault the option still appears and can still be switched on, but it does nothing at all: no stake is taken and no payout is made. There is no startup warning about it, which is why it can look like it is working when it is not.

Item betting does not need Vault and works on its own.

See Betting.