Well as Mark Zuckerberg put it during the congressional hearing—and this is a paraphrase—"we do not and have never sold data."

Which is true. They don't sell the data because they directly monetize it. Same with Google. Google didn't just start doing that one day, that's been their business model since they started doing ads. Apple's business model is selling users devices, which they would jeopardize if they tried to also sell their users' data.