This is one that we knew of in 2015, and the public researchers just found out in 2019: https://boingboing.net/2019/05/22/unique-device-fingerprints...

Now we're waaay past this easy stuff to fake stuff. This now considered to be basic.

Look into distill networks, but their public product is very far behind what we did. Not sure if they have better tech to be used in future.