One reason why I never joined meta, and forbade my friends to post my pic. I think you are correct with your assessment.
As I understand it, you can remove images from your page, but Zuck retains the image on their servers to use in training AI and facial rec. I don't know what happens to textual info, personal data.
Enraging, isn't it?
Zuck colluded with Cambridge Analytica to give T the Electrocute College in 2016, illegally sharing personal info of users to allow micro-targeting of pol ads. FB got fined some piddling tens of thousands for breaking the law. Good investment - meta is getting billions in return.
I posted extensively several years ago on how meta uses a tracking pixel to spy on people's medical information. Abortion rights and privacy proponents documented it and accused meta of enabling prosecutions of people seeking out-of-state reproductive care.
If there's that little "f" icon on a webpage, zuck is recording. The invisible "Meta" pixel allows Zuck to track all sorts of things about you. You might need to be a meta user for that to happen. You also need to enable scripts, another reason why I use NoScript.
The question is, how did someone become a zillionaire from a "free" service? Personal info is $$$. Clix are $$$. Wouldn't YOU like to afford a grossly huge compound in Hawaii?
The same holds for xitter, blacksky, et al. They're all evil. Invariably, when I see someone post a factoid from sociogarch media, it takes me only seconds to find a non-sociogarch source. Some of our colleagues here seem to do nothing but post empty links monetizing Musk with clix. Is it really that hard to type a sentence or two?
If the service is free, YOU are the product.
Please don't feed the vultures.