There is a lot of paranoia and conspiracy thinking here. Itch in the article says that the main group is Collective Shout which is against violence against women and girls: https://www.collectiveshout.org/open-letter-to-payment-proce...
There is no chance in hell an organization like that wields anything close to the power required to force these kind of decisions.
Either it is the payment processors or the regulators, or a combination of both, or some other kind of group behind the scenes. Personally I don't know what the true answer is, but it's clearly not some activist organization.
It doesn't take a lot of people/very big organization or a lot of money to do, just a willingness to be loud and obnoxious, but in a legal way.
It's the same thing with DMCA trolls that send takedown letters to demonetize things like YouTube channels. They don't need a lot of people/power/money, just a willingness to complain in volume and leave the evidence and fact finding to other people and/or automated systems like YouTube's auto-DMCA.
This is about power, not preventing violence.
It is classic 1970s TERF stuff. Dworkin identified real problems, but her solutions are bad and make the actual problems worse by targeting already-targeted people for greater policing. What they do do is give suburbanite women the rush of power and control, building their own little evangelical theocracies.