I get what you mean but you are very wrong about the stock market and how people react to export bans. Everytime US had restricted control for Nvidia chips in the news over the last few years, the stock price went down not up.
It might be a good marketing trick but it is not a good thing in the stock market given historical trends.
Your view highly screams you only have a superficial understanding of financial markets and you shouldn't extraploate that to "this is how market works because its all hype and everything is vapor"
Anthropic is chasing an IPO, Nvidia is not, creating very different market reactions and incentive structures for the companies. Apples and oranges.
Anthropics reputation as a near-term world-ender boosts their IPO directly.