you could remain anonymous if you post a note in the invoice with the account you want funded
seller wouldn’t know which npub paid it
Discussion
This is no different than vpn.sovereign.engineering over Tor
In both cases the broker (let’s call them) is centralized, but the buyer remains anonymous. Nothing linked together except a payment and an account to fund.
Obviously a bot automating this via Nostr would allow for more brokers to run the same automated bot, creating a market, but this is a marginal improvement if the other things have all been accomplished