Unfortunately, RISC-V, despite the "open source" marketing, is still basically dominated by one company (SiFive) that designs all the commercial cores. They also employ everyone who writes the spec, so the current "compiled" spec document is about 5 years behind the actual production ISA. Intel and others are trying to break this monopoly right now.
Compare this to the AI ecosystem and you get a huge difference. The architecture of these AI systems is pretty well-known despite not being "open," and there is a tremendous amount of competition.
