The thing about US' corporate suveillance system, and why the US government is so tolerant about it, is that US government branches either buy or are given all the data they need.
You don't get government surveillance or corporate surveillance, you get government surveillance or government and corporate surveillance.
> And Visa and MasterCard aren't surveiled?
Who is doing the surveilling is the difference. In the latter, the surveillance is done by the private sector, in aims of better targeted advertising.
In the former, it's done by either the government or by a government-tied organization, and thus invites a left-hand-passes-to-right-hand scenario, wherein the data & metadata obtained from the system could be passed to law enforcement for prosecution (doubly so if the transactions could be bundled as evidence).
> Isn't one of their selling points that they surveil every transaction and automatically block anything suspicious? And increasingly, the parameters for suspicious include anything pornographic or even 'pornographic' (see: the bullying of steam to remove explicit games).
The censorship pressures made onto Visa & Mastercard was done not by the government, but by PACs & non-governmental organizations. It is through the use of "think of the children" that they push them into censoring transactions, under the implicit threat that lawsuits will be filed if such transactions remain allowed.
Doesn't mean they will automatically expose you, as it requires justice approval technically...