Both sides are twisting words. Pirating truly isn’t stealing, but rather closer to unauthorized use. The word ‘steal’ is used because they want to imply that it’s the same thing as taking a physical thing that can be lost. It engenders a certain feeling that they’re wanting to invoke. Stealing sounds worse than unauthorized use. Doesn’t mean it’s not wrong to do, but it isn’t the sort of wrong that they’re implying.
Also the app is probably built on a mountain of dependencies all of which have updates and security patches and bullshit. Delaying those updates for too long makes finally making a real update a nightmare, so you occasionally release updates just to keep up.