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Site A and B have to collude in order to make that inference. Outside of Cloudflare, no one is colluding at that level.

• antonvs 6mo ago
  That would only be true if there were no ad networks. But today’s internet is essentially a giant ad network.
• camgunz 6mo ago
  Plenty of people own more than one website. You're also forgetting about random site assets like web fonts, CSS, JavaScript CDNs, etc. etc.