There can’t be a recipient; that’s the problem
well, you can but it's not trustless obv. Like, you can pay a NIP05 provider, and that is as good as how much you trust that provider
exactly my point is that if you buy POW to mine a disposable key clients could still show what otherwise would be filtered out by a WOT, without any client requiring to have any hardcoded "I trust this provider/relay" also, checking a NIP-05 is much more expensive (bandwidth) than a POW check