I don't know if it's still the case, but for example STM would assign you a PID for free under their VID if you were using their USB enabled microcontrollers in

I don't know if it's still the case, but for example STM would assign you a PID for free under their VID if you were using their USB enabled microcontrollers in your product. This was about two years ago when I last did it. The whole USB PID/VID problem is a cruddy and unnecessary situation. Bluetooth seems to support full UUIDs, and that's a low bandwidth protocol!