They don't want to have a long fight expensive fight with qualcom and make other arm companies uneasy about investing in the arm platform.
They also don't want to open the door to have companies buy their IP for "cheap" by buying smaller companies with special arm licences instead of directly negotiating with them.
Is it really ARMs IP or the IP developed by the smaller company. My understanding is ARM is like a blueprint, and you then make changes as needed.
https://en.wikipedia.org/wiki/ARM_architecture_family#Licens...
You can either licence a IP Core block(Core, gpu,etc) to embedd in your device, our you can buy an architect licence and design your own cores as long as they comply with the arm architecture.
AFAIK the IP is actually buildable cores which arm get's by partnering with companies to get it right, e.g. there is not that much difference between them fully building them in house and selling them vs. letting partners build them(for the end user).
The only reason small companies can get a license on easy terms is because of the narrow planned use.