At the end of the day you’re sending your queries to a third party server, none of these AI chat services are good for privacy because you basically just have to trust that they’re not logging your queries.
DeepSeek isn’t specifically bad, when compared to all the other AI companies like: OpenAI, Meta AI, Gemini etc
Your data isn’t safe with any of these companies whether it’s based in the US or China, the only solution is to run the model locally. Otherwise you shouldn’t use AI at all because it’s a privacy nightmare.