If people graduated from college with just a little bit of understanding of how slow ram is, how CPU caches work, how expensive allocating memory on the heap is (either, initially with something like malloc, or amortized with garbage collection) and if we stopped using languages that haven't at least built a good JIT yet, and use AOT native compilation more often, we would all be in a much happier place. Systems would be much more snappy, or we could add more features, users can run more things at once before it goes to hell, batteries would last longer.

None of this requires even changing what language you use, or massive changes in coding style. Just knowing some basic facts about how the computer works can let you choose the more efficient option among equivalently complex options -> "don't need a linked list here, let's use an array backed list instead" -> let's not use LINQ here because that allocates and this is a tight loop that runs on every request -> lets not use electron, let's build something with a similar external API that is more efficient

I doubt that. Developers will try to work within their quota so they don't have to ask for permission to use more and risk annoying users.

Also, it would create resource competition between websites and the adverts they use to fund themselves. This would lead to much less annoying ads.