The base ISA for RISC-V has been ratified, so there's a stability promise!
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RISC-V seems like a great example of "commoditise your complements". If you're getting value higher in the hardware or software stack, a royalty-free ISA is valuable.
Creating an ISA is a ton of work. Once it's basically viable, it creates interesting opportunities.
Blackbird: a desktop PC with zero proprietary blobs! Running the Power ISA (like PowerPC), although it's not cheap.
https://www.osnews.com/story/133093/review-blackbird-secure-desktop-a-fully-open-source-modern-power9-workstation-without-any-proprietary-code/