On their page about AMP Viewer Google admits that they are collecting user's data when they view AMP pages [1]:
> The Google AMP Viewer is a hybrid environment where you can collect data about the user. Data collection by Google is governed by Google’s privacy policy.
With replaced URL it will be more difficult to spot.
> The Google AMP Viewer is a hybrid environment where you can collect data about the user. Data collection by Google is governed by Google’s privacy policy.
With replaced URL it will be more difficult to spot.
[1] https://developers.google.com/search/docs/guides/about-amp