If the model is closed and served through an API, probably not.

But at the moment Mistral seems to focus on smaller and efficient models that you can fine-tuned and run on your own infrastructure.

Mistral 7b was free but if they come up with larger capable models, they can offer them with a non-commercial free license and a sell a commercial license for companies that need to fine-tune it.

Looking at the performance of small fine-tuned models on specific tasks, I think most company will prefer taking that route rather than trusting OpenAI with their own data, the market is huge I think.