This may not be the best advice, but it is what I did for a project that was required to have these statements. There are online templates and services that will create and host your terms and data privacy policy for free, with upgrades of you want more customized wording. The format is clunky and in my case allowed for more data collection than the app would ever actually do because I did not pay to customize it, but it serves the purpose. Termsfeed.com privacypolicygenerator.com You could just generate one to see the general idea and then customize it yourself if you don’t need the hosting.
I like your idea, but it just brings to mind how fragile all of our digital media is, not to mention the surrounding tech necessary to read and understand it. What we know works is to press your message to the future, grocery bill, whatever, into clay and then accidentally burn the city down around it – good for millennia.