It used to be the only way to use Gemini on iOS until very recently. That was the primary reason I originally installed it.

Other than that, I believe "Google Lens" (i.e. picture search) was also exclusive to that app on iOS at least for some time.

That is even funnier to me than the original post! Even Google's non-existant cancellation reps are terrible at their jobs. Like, Google Lens, which recognizes nothing, and Gemini, which is the worst of everything, THOSE are the things you are relying on to stop me from leaving? Really? Okay-ish search would maybe make me chance a free-trial to a paywall.