> You sound like you're very young and only joined mobile internet in the past year

There's no reason to make this a personal comment.

Regarding your actual point, I've had a 100GB limit for the past 5 years (since I got an iPhone 6), with a 4G connection.

Meanwhile Google Amp has existed for less than 3 years and already has massively widespread adoption. Technological change happens so rapidly that it's rarely a technical issue when something like this exists.