To use AMP you need to load JavaScript from the AMP CDN, which is operated by Google. From <https://github.com/ampproject/amphtml/blob/master/spec/amp-h...:

> The AMP runtime is loaded via the mandatory <script src="https://cdn.ampproject.org/v0.js"></script> tag in the AMP document <head>.

So you are handing over the security of your site and your user's privacy to Google.