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Ugh, Reddit. Their amp version is terrible for the exact reason you mention. I know every time I see a Reddit page on Google results that I'll make two page loads instead of one (this does make a difference on my country, where everything is slow). Then, when accessing their pages on mobile browser, there's a huge banner telling me to download their app. In this same banner there is a dark UX pattern, where the call…
My favorite is that they've recently started animating their "Get the app" button in the header. That's both immediately on page load, _and_ on an interval as you're reading, meaning it's impossible to read for more than a minute or so without an animation distracting you. Is it just me or has the mobile web taken a nosedive in recent years? Imgur won't even let you upload images from mobile anymore without their app…
I bet there are plugins for firefox mobile to remove those animations and nag window. Basically the "continue to mobile site" just close the banner since you are already on that site.