Hey, so this is super cool.
Google has been collecting call and messaging data about who you talk to or send text messages to for years. There's no opt-out, no notifcation in their TOS they're doing this, and you can't see the results of that collection in Google Takeout.
https://www.scss.tcd.ie/doug.leith/privacyofdialerandsmsapps.pdf
Between you and me, this is one of the most frustrating things about working at Mozilla. We spend _years_ busting our asses on privacy, agonizing over minimalist, rigorously anonymized telemetry, making sure it's all transparent and safe and has opt-outs, and the internet screams at us for it anyway. And every other tech company out there responds to the years of research it takes to prove they don't give a shit about any of this with "whoops yeah sorry my bad we'll definitely do something".