My understanding is that these action committees are the ones that pressured the banks and payment processors (whose partial functions are shielding their partner banks from bad PR) to do so.

I didn't read anything about those organizations being involved in any of the stories about the Pornhub thing. Do you have any evidence of them being involved or are you just speculating?

According to wikipedia, the Traffickinghub campaign, created by Exodus Cry's Director of Abolition, resulted on the credit cards ban.

Source: https://en.wikipedia.org/wiki/Exodus_Cry#Traffickinghub_camp...

I don't like copy and pasting my other comments directly, so ill just link to it [0] but the short answer is, they're pretty open about their pressure campaigns towards payment processors. There was also quite a lot of exposing during the PornHub debacle.

the linked comment has quite a few links attached.

[0] https://news.ycombinator.com/item?id=28304164