From the how-to: "Contain a <script async src="https://cdn.ampproject.org/v0.js"></script> https://cdn.ampproject.org/v0.js"></script> tag as the last element

From the how-to: "Contain a <script async src="https://cdn.ampproject.org/v0.js"></script> https://cdn.ampproject.org/v0.js"></script> tag as the last element in their head (this includes and loads the AMP JS library)." This is the big no go for me here - why would I need an AMP library, hosted on a third party domain I have no control watsoever. They can inject what they like, track initial script load etc. The same goes on if you want to include further content such as tweets etc. What do other folks think about these requirements?