Earlier quoted context omitted.
Laptop is a large problem still -- mainly due to GPUs. With desktop, we don't have to deal with the issues associated with a soldered-down non-free GPU; the mainboard works blob-free if desired but the user already expects to install a discrete GPU if they need one. With laptops, the GPU has to be integrated, and there are no GPUs in production today that don't require signed firmware (this is due to the DRM contract…
Are ISAs patented or copyrighted?
Both. Copyright applies to some aspects, patents to others, and then you also get into trademark rights. With the US having embraced effectively permanent copyright, ISAs will not be freely able to be implemented unless their owner expressly allows it (my understanding is that the Oracle vs. Google case solidified this thinking).
Fundamentally, that means you get to pick from RISC-V, POWER, or SPARC when selecting a well known ISA for your new device, or start signing licensing agreements (which always come with restrictions and oftentimes significant royalties).