I’ve been off social media for a very long time; kind of a hipster about it :)
I wasn’t able to identify where it came from, but I do suspect it’s the latter — which is really hard to deal with because it’s other people leaking info about you. But the same could have happened with facial recognition at an ATM or checkout.
Personally, I’ve accepted that being an American in 2021 just means being under constant surveillance. The fantasies of going off-grid will run into the realities of your human relationships.