They're not homogenous. The companies that don't make money go broke and cease to be. No sign of that from Google. They're buying the data to monetize it. If they were doing something unexpected like destroying it for the greater good they'd announce it.

The extraordinary thing here is if they bought the data to /not/ monetize it. That requires the evidence. Not the overwhelmingly expected thing. They are mutually exclusive alternatives after all. Go with the overwhelmingly likely one until you've got a solid reason not to. We don't here.