Let's say that for the same journey, an ebike is a half as much exercise as a pedal bike(or whatever you want, the actual number isn't important). A car journey is 0 exercise, it's infinitely worse. Going from a car journey to an ebike journey is infinite times more exercise, going from an ebike journey to a pedal bike is twice as much exercise.
By gatekeeping you're stopping people from making smaller improvements because they aren't going all the way