Why do web portals want me to use “their app”

I write mobile apps for our company using Swift for iOS and Kotlin for Android. I do so because that's what I figured out how to do, and we do quite a bit with BLE and 2+ years ago, the BLE shims for Cordova/PhoneGap weren't very robust.

Everyday, I see more and more push to write progressive apps, or somehow write my apps using web stack technologies. I'm fine with that. I perceive that more and more, the consensus is that you need to have a pretty good reason to write a native app instead of a mobile web app of sorts. I'm fine with that and am not opposed to succumbing.

The one thing I don't understand though is why many large portal sites want me to download and use their native app, when I go to their mobile web site. CNN for example. BBC. LinkedIn. Facebook. On and on. All of these sites and many other "large public facing" companies always have a banner up top suggesting I download their mobile app. If progressive is the way to go, why do these companies persist in wanting to offer me a native app? Have they just not "caught up with the times" yet? Are they able to better monetize me when I use their native app? What is their incentive?