"The average user has never used a website"? Really? The average user has never once, ever, opened their browser and gone to a website? Never read a newspaper online? Gone to LinkedIn or Facebook, done banking, made a doctor's appointment, found an AC repair shop on the web rather than through an app? Because I don't know what your definition of "average user" is, but I know a bunch of non-technical folks in ages ranging from thirty-something to eighty-something who do that all the time.

(Also, they sign up for mailing lists all the time, often whether they want to or not because everybody wants you to be on their damn mailing list. Email is absolutely still a viable broadcast medium, despite all the pundits declaring "email is dead" before they go back to, you know, checking their email.)

The average user has never once, ever, opened their browser and gone to a website? Never read a newspaper online? Gone to LinkedIn or Facebook, done banking, made a doctor's appointment, found an AC repair shop on the web rather than through an app?

Yes exactly. The difference is that you live in the us where you grew up with the concept of an information superhighway in the 90s. In most of the world the internet as websites never existed, it arrived with smartphones and thus social media apps and by extension some other apps. The things you mention were all done in person or via messaging apps until other apps were introduced. Actually most of the world still does those things in person or via WhatsApp. Well of course not Facebook, LinkedIn or online banking because they arrived with smartphones too.