btw, my email to Fastmail:

After reading GMail's announcement about dynamic email and your position statement on AMP, I am thankful to have switched to FastMail and looking forward to remaining your customer. I'm writing to ask you not to implement AMP dynamic email. Even though you don't have a huge slice of the email market, your customers are probably disproportionately privileged and informed (they choose to pay for email...), which positions you to resist these erosions to privacy and democracy in ways that individuals can't.

More pragmatically, I see your non-support of AMP as a big feature. If you don't support AMP, companies can't as easily put pressure on me to use a communication channel where they have all the control.

Thanks!