I created a google takeout and in that zip file I found some files containing a ton of data about me. It has logged every single page I visited while using the google search engine and chrome browser. It even logged every single time I opened an app on my old android phone. It even has VOICE RECORDINGS of me and a log of every time I used google assistant. This is just some of the data and I’m very sure there is even more data they have.
You know they can suck up Activity Pub and sell that too, right?
The only difference on the fediverse is that all of them can mine the data, instead of just one of them.
The difference is in what type of data is made available. They can’t suck up your IP address through ActivityPub.