Then, could not we a get a trace of the properties it uploads to the server by analyzing what is executed in the javascript? Sure it has some sort of submit endpoint where it throws the individual values to.
I see things hat look like font fingerprinting, CSS, Apple pay detection, ... , msPointerEnabled, ..., webkitResolveLocalFileSystemURL, ... cookie settings...
... used mathematical library (sinus, cosinus, ...)
serviceworkers, ...RTCPeerConnection, hardwareConcurrency,
Maybe we could dissect it and analyze the full list?
At some other place, they documented e.g. you can get the light/dark theme information out of the CSS. Doesn't even need JS to do it.
It looks like it is using heavy obfuscation.