Yes, inverse profiling works this way. A group with known individuals communicates constantly with someone who ain't using FB or Insta. You still know this person quite well, easily identifiable, maybe lacking some information but more than needed.
This is also why privacy has been a game over for decades. Ten years ago or so, friends boasted that they don't use Gmail due to privacy concerns but happily email folks with Gmail accounts.
One group picture is sufficient, you can work from there.
One pertinent difference is that a web property may correlate your captured biometric data with whatever they get out of your connection, making entity resolution much easier and more valuable.
ELI5 when you visit online they have a handle on you.
This site wants to share your cookies to at least 662 “venders” and they are being dishonest with the “legitimate interest” scam. The creator clearly does not care about nor respect their users/visitors.
It's so wild to me that people tolerate this. I just close the tab or 'reader' whenever I see that type of thing, but I know very few others who do the same.
I mean, if a website claims to have tens if not close to a hundred "legitimate interest" cookies I'm reasonably sure they are living of wildly invasive ad tracking. I immediately close these websites just as you do.
It would be swell if more of the web was made by passionate people to share knowledge for free. I know this is a privileged attitude as creating content takes time which is not free. But some of the best web sites are the ones without monetisation. We need a better monetisation system for the web that is based on people paying for content instead of people being sold as user data.