Earlier quoted context omitted.
That's not how Western Union works. The recipient goes to WU and presents matching ID.
Western Union doesn't claim to be accepting donations on creators behalfs. Western Union can refund money sent if it hasn't been collected by the recipient. Western Union doesn't require a minimum amount of money be sent to a recipient before they collect. Really, it is 1 & 2 together that seem to mark this clearly as fraud. 3 doesn't help either.
Strictly speaking, Brave is not doing that. The fact that the originator of the solicitation is Brave, and that the potential end-recipient may not sign up to receive the funds, is disclosed.
It's an escrow fund that would release the funds to a particular party should they choose to claim it. That's how the contribution service is marketed.