Apart from greediness there is no reason for data to be so expensive...
Sure there's always room for an amount of optimization and good practice but it's insane to rely on that instead of fixing the problem. The growth in page size has been fairly linear and predictable.
The real headline here should be "German and US carriers cannot keep up with natural growth in technology"
So tell me: Out of a 2 MB website with 300 HTTP requests, what do you usually get as a visitor?
You make it sound as if the natural growth in technology is what makes these websites huge. I run a web app, which is uptodate technology-wise. It has a responsive design with @2x images and @3x. It uses JS in a sensible manner. It's fast and easy to use. Top notch technology. Yet, the average request sums up to 200KB. And 60KB of that is a custom font.
This is not about the natural growth in technology, it is about 50-70% of the 2MB are entirely worthless to the user, because they are usually Ads, trackers, wrongly compressed images (ImageOptim does wonders here) and using 10 JS frameworks in parallel.
It's almost as if you're saying: See, img tags now support the width attribute, so let's upload a 10MB photo and just tell the browser to resize it to 100px, because technology.
I'm not picking through all that hyperbole and condemnation of every dev that isn't you to try a maintain a reasonable argument.
So I go with a "those in glass houses" approach:
The only reason I can't see the terrible quality of your website's photos on my phone is that all the content is so damn small and zoomed out I can barely make out the text never-mind the picture pixels. I don't really want to zoom in because the shade of lime green you've chosen is so jarring it'll likely give me a migraine if it fills the screen.
Sure there's always room for an amount of optimization and good practice but it's insane to rely on that instead of fixing the problem. The growth in page size has been fairly linear and predictable.
The real headline here should be "German and US carriers cannot keep up with natural growth in technology"