itch.io

It's literally a duopoly. Everything you think is another system: Patreon, Stripe, Paypal etc is really just Mastercard/Visa with extra steps. Vanishingly few things are done via direct ACH bank payments.

The problem with "We'll make our own payment processor for blackjack and hookers" is that banking and payment processing is highly regulated so there's a huge barrier to entry, plus most people don't want to have to create multiple accounts to buy things online.

I'm not a crypto guy or anything but this might be the only use case I can see for it since it's still unregulated and decentralized enough that campaigns like this wouldn't cripple entire industries.