Yes please don't emulate the Chrome/Android permissions functionality (particularly Android).
Android apps often ask for broad permissions upfront just to do a one-off thing, like inviting your friends to use the app. Then they get to keep that permission for as long as the app is installed.
And it's "take it or leave it". If you're not happy you get to stop using the app/service, or you just have to bite your tongue and install anyways. Ugh.