I think you're agreeing with GP -- it only allowed software signed by Microsoft (in other words, you couldn't run your own software or operating system unless M

I think you're agreeing with GP -- it only allowed software signed by Microsoft (in other words, you couldn't run your own software or operating system unless Microsoft said so). In this hypothetical proprietary RISV-V scenario, you might not even be able to run unsigned code on the device and so nobody is going to bother supporting its weird instruction set.