If it’s not Pokémon Go, it’s just going to be another application. I’ve heard local cops say they have seen people on their bloody laptops while driving.
From experiments with my own boyfriend and myself, the “cut off” speed for catching Pokémon is around 50 mph. The “cut off” for eggs getting closer to hatching is supposedly around 20 mph.
Have passengers play the game while you drive. Turn the phone on silent and turn it upside down on your passenger seat. The point is, there’s safer alternatives to having the screen right in front of your face while driving.