I mean they can watch and monitor your activity on their website, and are probably partnered with many other websites to collate data on your interests and beliefs to feed into a chunky advertising algorithm sooooo…
But you didn’t want to hear that, did you?
Yeah. Just to clarify, I didn’t mean to try to validate conspiracy theories like these and wasn’t suggesting that this guy is right, but that it’s wrong to ignore the large amount of data that closed source applications oftentimes do collect on you.