[magnusss]

Any email with an img tag can change its contents between views. AMP is not required to do that. The img content is retrieved from a server (or a proxy) every time the email is opened, and that content can change between opens.

[vxNsr]

To add to this, citi recently starting using this to notify you when you reached your spending bonus after signing up for a new card. I've seen it used to load gifs that are countdown timers that once the final time is reached will always display 00:00:00.

I dislike this immensely if only because as others have said it ruins the immutability of email. But it does already exist.

[Dylan16807]

Also bad, but gmail at least tries a bit to anonymize and cache.

But sure, what they should be doing with amp is fixing that, not making it worse.