That's a ridiculously unprofitable business model, of course they don't but almost entirely because that idea is unsound and not at all practical.

When a hotel offers privacy for instance, they aren't saying they'll wear a blindfold to check you in - their data retention policy is identical - they're talking about privacy from others.

When a plane offers privacy in first class, they're not saying they'll shred your fight record after landing, it's privacy from others.

When uber is offering privacy, they're not saying you can anonymously book and crypto pay the amount, no, it's privacy from others - they know the same amount about you as any other user

I have a friend here in LA that does privacy centric medical services (hiv, drug rehab). The target demo is celebrities who are shying away from paparazzis and gossip columnists. He still has the customer list however

They 100% sell your transaction information, as does Visa and MasterCard. Google buys that, as do Amazon and Facebook and many other companies.