I am not sure if Mistral is: if you go to their GDPR page (https://help.mistral.ai/en/articles/347639-how-can-i-exercis...) and then to the erasure request section they just link to a "How can I delete my account?" page.

Unfortunately they don't provide information regarding their training sets (https://help.mistral.ai/en/articles/347390-does-mistral-ai-c...) but I think it's safe to assume it includes DataComp CommonPool.