Roon does not charge a licence fee to the manufacturers for its use

…or maybe you are being impatient and jumping to incorrect conclusions. Here is an email and screenshot from NAD showing M33 being Roon Ready:

and here is the M33 on our NAD page:

That makes sense since their founder has publically stated that they are making a competing product to Roon… Although I’ve not heard any more news on that front for a while now (year+). Maybe they are getting close?