Doesn't matter. That's what the majority of people are using; so if you want the marketplace to actually be able to serve people, and get them to actually buy stuff, you need to support them.
What the majority of people are currently using is irrelevant. The whole topic of this thread is creating decentralized markets, and you're saying the fact that these payment processors are centralized doesn't matter. That doesn't make any sense.
Perhaps the idea of a decentralized marketplace is a bad idea? What benefit does this actually give me in my everyday life where I don’t need to buy toilet paper anonymously?
They're something that most people are actually using, allowing the marketplace to actually conduct commerce and exist.