That’s pretty much how all payment processors work. The issue for them is that letting fraudsters continue making payments will lead to big Ls for the payment processors, since they end up being on the hook for the money that card networks will clawback or liability from regulations and money laundering laws.

You're free to try running a payment processor with a mantra of "Innocent until proven guilty."

You'll be a honeypot for every scammer, fraudster, and con artist ready to take advantage of that policy, your processing fees will be through the roof because of chargebacks, and the only people who will use your platform will be the aforementioned scammers, fraudsters, and conmen.

I'm sorry for the GP poster's situation, but there's really no way to make everyone happy, here.

Payment processors could assign reputation to longtime users, and they could have a vetting process to users as well, just like banks do. Get their full credit history, all the info of their owners, etc.

They could also communicate problems more clearly and provide better support to those who are sanctioned.

It's a reasonably solveable problem.

See: crypto. Marvelous technology. Ruined in the public's eye because of the amount of scams in it. Those same scams were used as justification for strict KYC laws. Which did not do much to stop the fraudsters really, hurt legally operating investors' privacy instead.