It doesn't make sense to focus on Collective Shout mostly because they're doing something anyone can do: yell at payment processors. They can be replaced by another group. They are one head of a hydra; others include the wildly influential Exodus Cry and the Heritage Foundation, which has a direct line into US politics.
Right now, people are actively organizing and participating in call-in campaigns to do the same thing Collective Shout did: yell at payment processors, but in larger numbers, and make listening to these censorious puritan weirdos far more annoying than minding their business would be. If you want to get involved, this is a fantastic place to start: https://stop-paypros.neocities.org/.
We have a lot of people calling, but we need new people to step in. After a while, those of us who have called several times are recognized by case numbers or previous call info, and it becomes easier for them to hang up on us or say we've already been given all the information they have, resulting in shorter calls. Folks who have been calling since the start are also more likely to get burned out, and this is a long-term project. It's extremely valuable to have new people dialing in so that the volume of calls doesn't go down and they realize this is impacting a large number of customers.