I'm confused I thought Apple only allowed web browsing via Safari... "2.5.6 Apps that browse the web must use the appropriate WebKit framework and WebKit Javas

I'm confused I thought Apple only allowed web browsing via Safari... "2.5.6 Apps that browse the web must use the appropriate WebKit framework and WebKit Javascript." If apps can use their own in app browser, why can't say Brave for example, create an app that does very little, except it browses the web with its own in app browser?