Sure a lot do, like the professor in the article, but that doesn't mean they all do. There are some that don't care and I'm sure others who haven't thought about it or rationalize the situation because it benefits them immensely.

That is to say making generalizations like that boils down the issue to "Professors care" vs "Professors take advantage of students" neither is absolutely true for the system as a whole.

But perhaps the mathematicians are on the far end of the spectrum, since their ideal work environment requires nothing but a writing utensil and a writing surface.