> And what would this pornhub app do that you couldn’t do from the website?
Store files for offline use or untracked use, have better privacy because user settings can be stored locally rather than on the server, provide source code that can be audited rather than relying on javascript that can change at any time, etc. In general, anything an app can do that a website can't -- otherwise why do native apps even exist?
> Should Nintendo also be forced to sell a PornHub game?
They shouldn't be allowed to prevent someone else from distributing one.