Surprised to see no one here is worried about privacy. Z.ai's privacy policy pretty much allows them to store and use prompts/code in a perpetual, irrevocable, worldwide, sublicensable license to use and train their models.
I have already assumed that on every chat service I use, they store and train on my prompts either way, since I use the service for free. If you actually want privacy, host it yourself or look for a llm service with another business-model