If you ask #LeChat by #MistralAI whether it uses or not your data, it answers that it is not concerned since it is not associated with Mistral AI and its application.
But questions about its data use have been raised. To read [in French] https://www.frandroid.com/culture-tech/2502271_la-start-up-francaise-mistral-le-chat-dans-la-tourmente-pour-entorse-presumee-au-rgpd