Some commercial advantage I'm not aware of?

1. No licensing cost upfront for tap-out.

2. Open source designs so you can even decrease tap-out costs further. Allowing you to focus on the features you are selling.

3. Out of the box compiler support for GCC and LLVM.

4. Provided you stick with RISC-V one doesn't have to re-pay their software development cost every generation. Your compiled ELF's will still work. Software Development $$$ >>>> Hardware Tapout $$$.

5. Out of box compiler/debugger support. Not making your dev team adopt a new tool chain is a HUGE time saver and cannot be understated.