Nobody is setting up "privacy-friendly" frontends to track browsing data that they couldn't otherwise get without access to Google's/Twitter's/etc. logs? Because I think they are.
They are all effectively proxies so you do have to trust them to some extent, but unless these frontends are run by a large company, I think they couldn't care less - and likely don't even have the resources to accumulate and analyse all the data that passes through them.