I don't think Steam wants any more from me than any other payment processor. And for that matter, if you don't want to give them CC/address, you can use Steam

I don't think Steam wants any more from me than any other payment processor. And for that matter, if you don't want to give them CC/address, you can use Steam gift cards, right? I confess I'm not sure; I've trusted Valve with a very specific part of my life (buying games) for nearly 20 years now, and they've held up their end of the bargain the entire time. My trust in them has paid off (so far!)