I hope they can come to some sort of agreement or find a way to acquihire the Apollo developer (though that might kill the app with crappy features as well).
Yes, the obstructive popup when you visit reddit on a mobile browser to force you into installing the app. Other than that only if you want to do more than read.
Reddits main function as a porn facilitator will really hamper its desire to make lots of money as a publicly-traded business.