Will some new megacorp come to depend on these new things, if they are good and successful? Probably! But I don't want my business model to be "design cool things for free, then clumsily attempt to extract rents from people I can trick into depending on them".
So anyway uh turns out this wasn't really about payment processors, but you can pay me for that on Patreon https://www.patreon.com/creatorglyph but please don't pay through the iOS app. No need to make a donation to Apple in the process.