They probably have a deal similar to DuckDuckGo:

As noted above, we call model providers on your behalf so your personal information (for example, IP address) is not exposed to them. In addition, we have agreements in place with all model providers that further limit how they can use data from these anonymous requests that includes not using Prompts and Outputs to develop or improve their models as well as deleting all information received once it is no longer necessary to provide Outputs (at most within 30 days with limited exceptions for safety and legal compliance).