Come on, compared to Google Workspace / Microsoft's whatever-it's-called-these-days, the cost of switching from one LLM provider to another is pretty much zero.

Having an option at the back of your mind is all it takes right now, until push comes to shove of course.

Just a sample: https://mistral.ai/customers

And you can Google for "We use Mistral" to find thousands of usecases by startups and other companies.