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A valid concern. However, nothing is stopping people from doing the same right now with a big old forced Kofi/patreon/whatever banner, and I’m not sure that this changes that.
The advantage of this over current options is that like RSS, you can consume/deliver it however best suits you without needing to have different accounts of different platforms.
Thats absolutely possible via the underlying WebPayments API. The payment “wallet” is linked in the HTML (at least for web pages, RSS, podcast RSS, etc) so someone could design an app that reads these links as QR codes.
The whole point of WebPayments is that and payment solution that you (the “spender”) wants to use which is compatible can be used to send money to any compatible wallet.
Whether the payment solution is via government backed, banking systems, or crypto, all it needs to be is compatible.