Various industry surveys, like the one from comscore in 2019 suggest otherwise. IIRC it found that most American phone owners install only 1-2 new apps per year. I think they would've gone to more new websites than that.
That study doesn't imply what you suggest. Yes, most Americans install 1-2 apps per year: Facebook, Instagram and similar, and that's all they ever use. That segment of the population doesn't use the mobile web either; they spend all of their time in 1-2 walled gardens and you're not going to reach them with an app or website.
