What they are doing is already discouraging people from contributing to the projects their tools are replacing[0]. If they go out of business and stop supporting their tools, it might leave the Python community in a bad place.
I'm not sure what the maker of that video wants, does he want money to be poured back into the community, or for no one else to make money?
I agree that we have no idea how it'll play out. But I've seen nothing but good faith from Charlie and others, and I see no reason to preemptively condemn their attempt to build a business.
In this case they are replacing Python code with Rust which might exclude large part of Python community from being able to contribute.
(Or another framing: only the tiniest fraction of the Python community was contributing to CQA tooling in the first place. It's not clear that prioritizing the interests of the 99.9% of Python programmers who -- rightfully! -- will never modify these tools makes sense.)