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So that's what those are supposed to do? Everytime I click on one I get an error, currently it's "Error 1016 Origin DNS error". Never actually saw what's behind that site but it does not seem like a working domain.

Are you using Cloudflare's DNS servers? Yeah, it doesn't work with that, for some reason.

Same way scummy ad networks do it (in fact they probably use ad networks' tech), google 'browser fingerprinting'.

There was an article posted on hn like 18 months ago about how to detect users across incognito sessions, defeated by switching browsers entirely

Word got out