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RISC-V is just ISA. I don't think ISA's can be patented. Just some specific instructions.

Yes, they did the research for prior art to make sure that is the case for their instruction set.

ISAs can be patented. Intel is patenting their latest AVX/SSE instructions.

ISA spec is copyrighted. Instructions aren't patented directly. Instead, the best ways of implementing them are patented.

Seems like Microsoft is potentially being targeted for writing an x86 emulator https://newsroom.intel.com/editorials/x86-approaching-40-sti...