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Any links sent in an email can become unique to the recipient.

Link a link shorter, but the URLs are not short :-)

You can know what link was clicked and who clicked it.

So even if the images are blocked, if you click a link it goes through the link shortener redirection server, and bingo! They know more about you! :-)

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Sure, tracking pixels worked this way, you give the image a unique hashed filename.

But these "spy pixels" that can see the street you are on. I've not been following this space, but google proxies the request, how does the spy pixels active spyware payload deploy even? And if they are using the ip address that is just a google IP (or a cloudflare IP if I'm going through WARP).

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