Mistral AI's 21 billion euro valuation is a nice headline, but it's a single data point for one company, not a universal validation of the EU AI Act's regulatory viability. Investor confidence in a company's potential doesn't magically resolve potential legal compatibility issues or guarantee the Act's long-term effectiveness. It's like saying your car won't break down just because one mechanic gave it a quick look; you still need to stress-test the weakest link in the system.