> When you use Unpaid Services, including, for example, Google AI Studio and the unpaid quota on Gemini API, Google uses the content you submit to the Services and any generated responses to provide, improve, and develop Google products and services and machine learning technologies, including Google's enterprise features, products, and services, consistent with our Privacy Policy.
Google inference is a lot cheaper since they have their own hardware so they don't have to pay licensing to NVIDIA, thus their free tier can give you much more than others.
Other than that the catch is like all other free tiers, it is marketing and can be withdrawn at any moment to get you to pay after you are used to their product.
What's the catch though? I was looking at Gemini recently and it seemed too good to be true.