- "what kind of sites use them?" Here's a good sample set (AMP posts on Reddit, sorted (roughly) by popularity): https://old.reddit.com/user/AmputatorBot/?sor

- "what kind of sites use them?" Here's a good sample set (AMP posts on Reddit, sorted (roughly) by popularity): https://old.reddit.com/user/AmputatorBot/?sort=top&t=week https://old.reddit.com/user/AmputatorBot/?sort=top&t=week