I don't want to use AMP in email so I'm not going to. It's just that easy.
What are you doing and what do you suggest the rest of us do? Is voting with our wallets not a thing any longer?
While it's certainly not totally impossible to vote with your data, you should remember that you are the product for google. The customers are advertisers. Not you.
On a serious note I don't like the negativity in your comment and I don't think there is anything insightful about it. I believe the free market is based on individual actions. I will continue to choose services based on how well they serve my needs.
A familiar example is the NRA. It's not a political party, but it advances the interests of its members relentlessly. Institutions of the left include things like Planned Parenthood. Often, there are issue advocacy organizations that spring up when corporations are doing bad things. Often the strategy is to do things that impact the corporation financially, which short of legal threats is basically the only thing they understand. Anything short of that can be brushed off with rationalizations by various powerful stakeholders within the corporation.
Basically, the point I'm trying to make is that individual action is essential, but not sufficient to make a difference when it counts.
Then again, maybe AMP is their solution to this third-party interface "problem": create an incompatible "feature" that will encourage or force users to abandon standards-based tools.
Kind of like what's happened with Google Talk. God I miss the Mac's Messages app being able to interface with my work's gsuite chat.
FWIW, the iOS email client has improved a lot over the last few iOS versions. Worth checking out if you haven't looked at it for a while.
My point was that you can't go it alone and there are friends that will help you. I left a more theoretical justification in another sub-thread.