You seem to think that your response to any possible political idea MUST be either to donate to it, or use all possible power to attack and silence it. It's obviously a ridiculous false dichotomy. It is possible just to live and let live.
1. Not actively providing resources to a position you dislike
2. "Using your power to silence" positions you dislike
I know you've said these are equivalent, because you're arguing that certain people owe other people a platform and associated services (1), and you've used the language of (2) to shame them for not doing it.
The only thing left to do at this point is ask if you're willing to practice what you preach.
Simply treating a customer the same as other customers is not equivalent to actively providing resources to a political cause.
And yes, payment processors do owe it to customers to treat them equally with regards to their politics and beliefs (as well as their race, gender, language, and so on).
You seem to want to live in a world where wrongthinkers are viciously persecuted by every person, every business, everyone in every possible way. Because you think you'll always be in the team with the power to do that. When you have the experience of being the hated minority, you'll understand the value of equal treatment and the norms of individual freedom.
Politicians of explicitly right-wing alignment control:
* The US Presidency
* The US Senate
* The US House of Representatives
* 33/50 US governorships
* Legislatures of 26/50 US states
and are about to install a conservative-leaning majority into the US Supreme Court.
Rosa Parks you ain't, bud.