I tried to use that and after I received an expensive aptX-LL capable receiver I found out my Google Pixel doesn't support aptX!

I've been wanting an Opus powered headset too, for years. Maybe someone can make a non-A2DP opus receiver and some type of virtual audio device in PC and Android?

If it's 25 years old the patents either already have expired or are due to do so soon. Patents don't last forever.