Hang on a second,
it's fair enough to ask the questions, but not to assume you know the answers too, and then comment on your assumptions.
The reason we know that RISC-V is an open specification, is that it's published and freely available for anyone and everyone to inspect and use.
It's also widely known that the ISA was created in order that students could do some practical work in developing processor designs, without infringing anyone else's Intellectual Property. And for that point alone, RISC-V serves its purpose, and contributes hugely.
You generously point out that there are a number of open source RISC-V processors already available, from companies like Western Digital, OpenHW and T-Head. There are also already millions of proprietary RISC-V processors in tech since 2017, when nvidia started using the ISA, 2019, when Qualcomm started using it, and 2020, when Samsung followed suit. It's suggested that there's RISC-V in Apple products too, but I haven't the evidence to support that.
So yes - there is a very real distinction to be made between open source RISC-V processors (which will continue to arrive, at a slower pace), and their closed source counterparts.
Quite frankly, I don't really care what the US tries to do about RISC-V. As I've said any number of times on this forum, any action the politicians take only does its own industry injury. RISC-V is a thing, it's prodicted to grow its market share because it can beat ARM on PPA. US tech companies not only want it, but know they need it to remain competitive.
The bottom line is that the US government wants RISC-V too - they just don't want anyone else to have it, because it levels the playing field.
But the US can't stop RISC-V's use any more than they can prevent people from using alternatives to Microsoft or Apple software.
And the reason that RISC-V is developing so well, so quickly, is that people, educational institutions and businesses are choosing to collaborate to improve it.
But you are right about one assumption: I would prefer an open source processor over a proprietary one.