There should be scare quotes around Privacy Advocacy Groups. All of the listed think tanks are for sale. EPIC, an actual privacy advocacy group, is not. https://en.wikipedia.org/wiki/Electronic_Privacy_Information...
How do you know EPIC isn’t for sale? They don’t disclose who their donors are.
https://www.charitynavigator.org/index.cfm?bay=search.summar...
They're a 501(c)3, they take donations off the front page of their website. Sure, you might be curious who is donating? Or if there are any donations over a certain amount? I don't see any of that for The March of Dimes, either, do we question whether they are "for sale?"