It's available for me in Brave anyway. "Install app" it says.
Ok I see that, but it is different to install an app which can grant additional device permissions compared to merely adding a site link to the screen.
They call it app but it's not a normal (native) app, it's a PWA which is pretty much just a glorified (normal) website. It still runs in the browser like a website.
https://community.brave.com/t/add-shortcut-to-home-screen-vs-install-app/311223
Progressive Web App, ok. I had not heard of that
(post is archived)