For me, it was my school's enforced reading and book reports that taught me to skim and just pick up enough info to write a report, and the internet was ultimately what restored my capability to read and attention span, as I could find things that genuinely interested me.
Obviously, the internet has changed a lot since I was a kid, but I'm not entirely sure that there's just nobody being exposed to larger amounts of text and that few people online have interests greater than TikTok.
I think this is pretty natural given we live in an information-abundant world now. Taking the time to read everything you could get your hands on makes a lot of sense when you don't have constant access to everything.
For me, there are some writings that are really great and some that are a drag. I typically skim to figure out if something is really great. If it looks good after a skim, I'll dig deep. I suspect many others are the same, though there probably are some junkies who never dig deep.
Obviously, the internet has changed a lot since I was a kid, but I'm not entirely sure that there's just nobody being exposed to larger amounts of text and that few people online have interests greater than TikTok.