Gemini's free tier will absolutely use your inputs for training [1], same with Mistral's free tier [2]. Anthropic and OpenAI let's you opt into data collection for discounted prices or free tokens.
Yeah, I mean paid API access. You put a credit card in, and it's peanuts at the end of the month. Sorry I didn't specify. Good reminder that with free services you are the product!
[1]: https://ai.google.dev/gemini-api/terms#data-use-unpaid
[2]: https://mistral.ai/terms#privacy-policy