Earlier quoted context omitted.
It’s a matter of time before they acquire the top app or two and block the rest.
IIRC the official app is from them buying AlienBlue, which used to be the best one on iOS. These days it's Apollo. Apollo recently moved some push notification features behind a subscription to cover ongoing costs, separate from their "Pro" one time in-app purchase, so I think Reddit is at least taking a cut from API usage by other clients.
I'd be happy to pay them, but I actually don't WANT push notifications, posting from the app, or any of the other stuff that encourages websites to pull you in deeper.
And the only reason I even use Apollo is because mobile Reddit is a nightmare UX. Literally a case study in how to make a horrid, horrible experience on the mobile web.