The Actual ARM license and IP, is relatively tiny in overall cost of the chip. It is a very small amount of money for time to market and ecosystem.

ARMv8 ( Specifically the aarch64 part ) is like a clean start. I doubt RISC-V offer any advantage, especially we should now know the uArch is only tiny part of the equation, the implementation matters a lot.

Apart from the fear of lock in or ARM suddenly hike the price 100x, what exactly is the benefits and motives for RISC-V?

Or is this more of NIH Syndrome?