[eyakubovich]

It's unclear when homomorphic encryption will be ready for prime time, especially at big tech scale. It's easier to give up the data under assurances of how exactly that data will be used. Secure enclaves (e.g. AWS nitro enclaves) can be used to offer cryptographic attestations as to what the code is doing with the user data. Practically speaking, an average user won't inspect the code, of course. But it does allow for other companies to audit and vouch for the usage.