Use ChatGPT etc and then get a lawyer to review. Most good lawyers wouldn't mind that. They use boilerplates anyway (A really good lawyer told me that). You could try a prompt like "Build me a Privacy Policy similar to <a similar product/company>"
For a thing I am a part of, we use templates that were written by lawyers, adapt them to our circumstances and then the board just decides whether they’re adequate or not. No AI necessary and way cheaper.
During the early stage before you need/can afford a lawyer, use one of the many tools that gives you a good enough template. I've copied a few for me and others from <a href="https://commonpaper.com">https://commonpaper.com</a>