I agree with you, I think this is primarily an issue with selfish people littering the environment. I didn't like how the article framed it as a "companies are littering" thing, as if it's factory waste.

Though... I also agree with the GP. It seems to be too hard to educate or enforce littering laws on consumers (edit: in some countries. Some other countries like Japan have better non-littering cultures). It might be easier to mandate things like biodecomposable plastic or... glass? That would be less harmful even if disposed of improperly. (How else are we going to get sweet drinks? Drink dispensers and enforced personal bottles?)

When I was young and playing in wasteland we often came across broken glass bottles etc. Very dangerous.

They were also regularly blamed as the source of wild fires.