"On one hand, I actually don’t begrudge Anthropic not wanting to help its competitors; on the other hand, what should be blisteringly clear is that Anthropic does not think that anyone else other than them should even be making frontier LLMs."

I don't find this blisteringly clear at all. A company making it harder for competitors to steal their IP is perfectly normal. This is Ben Thompson's personal grudge against Anthropic showing, yet again. He can't think rationally about this company.