That’s a fairly common fingerprinting technique. A lot of sites use this and similar techniques (e.g. GPU fingerprinting, font fingerprinting, etc.) See https://developer.mozilla.org/en-US/docs/Glossary/Fingerprinting

Or try https://amiunique.org/ for a live illustration how that works.

It would be possible but extremely difficult and expensive to launch even a single rack, and it’s not scalable beyond maybe 1% of existing compute capacity, and the entire thing is a giant grift with the only purpose to prevent Elon Musk from losing all his money.

Except solar. And wind. And hydro.

YOU ARE UNDER ARREST FOR FELONY CONTEMPT OF BUSINESS MODEL