Comment by madeofpalk

Both WebUSB and WebBluetooth is still a draft spec, and is doubtful to progress any further with both Mozilla and Webkit objecting to it

https://mozilla.github.io/standards-positions/#web-bluetooth

https://webkit.org/tracking-prevention/#anti-fingerprinting

Essentially, these are proprietary that are a part of an embrace, extend, and extinguish strategy by Google Chrome.