Most people don't read anything with long passages, online or offline. Only about a 1/3 read something of any literary value. https://www.publishersweekly.com/pw/by-topic/industry-news/bookselling/article/93659-nea-finds-worrying-drop-in-reading-participation.html
1/3 is a lot!
Interestingly, younger people are more-likely to have read, but those who read, were less-likely to read something literary.
That makes sense. I read much more when I was younger. Now reading requires me getting up and finding my reading glasses so there's more friction.