Actually, ebikes will get you much LESS exercise

[DDBB]

20mi. ride for us today w/ a lot of hills.. We'd rarely go that far on our dino bikes but we still got a great workout on the ebikes and we didn't have to get off and walk anywhere. I guess I'm preaching to the choir

 

[6zfshdb]

In reality, ebikes are like most pieces of gym equipment. They will get you as little or as much exercise as you prefer. It's up to you to use them appropriately.
All I know is, ebiking is far more fun than riding an exercise bike and consequently, I do it more often.