Completely unrelated to this article. But can anyone explain why my WH-1000MX3's (Bluetooth on Android) volume lowers for a few seconds loading this article? Seems to restore to normal volume after the cookie wall disappears.
Fingerprinting scripts often use the Web Audio API (see https://audiofingerprint.openwpm.com/). Sometimes, they use enough of the Web Audio API that the OS thinks they're trying to play audio, and it temporarily reduces the volume of other audio sources, sort of like when it makes your music quieter so you can hear GPS directions more clearly.
Probably because it's trying to play a video ad.
Could it be accessing the microphone which causes a switch to the Bluetooth HSP profile?