Did they? A lot of then were barely used, got damaged or vandalized, etc. And when the companies folded or communities outlawed the scooters, they end up as trash. I don't believe for a second that the amount of pollutants and greenhouse gasses saved by usage is larger than the amount produced by manufacturing, shipping and trashing all those scooters.

Their batteries on the other hand…

Sure, they're worse than walking or biking, but compared to an electric car battery or an ICE car?

At least where I'm from, scooters have mostly replaced walking and biking, not car trips :(