[3dfan]

First, no, you cannot reduce a thousands of words long legal document to a few words like you did and say "Easy, this is how it works". Those thousands of words are there for a reason.

Second, good luck, figuring out what you have "a contract, permission or a lawful task" for under the specific circumstances of your site.

Third, good luck, making and understanding an "agreement that binds them" with every provider of every piece of infrastrcuture you use. Good luck doing that for even a single piece of infrastructure.