My anecdotal experience is that those scooters (as in "trotinette" in French, not what we call "scooter" in French) where a plague, drivers are completely careless and dangerous and despite the law, they where always parked in the middle of the street at annoying places. I have no such griefs against bikes, even if they are much more numerous (I have other complaints again those, like the fact they don't respect traffic lights, but it's far from being so annoying).
The overwhelming support of Parisians to remove them is not a surprise (they would get a huge backlash if they wanted to do the same with bikes, which kind of prove the fact that they cannot be put in the same boat).
Also there is the ecology argument which Parisians are typically somewhat concerned with (those crap scooter were fragile - so they had a short life expectancy despite having a large impact to build because of the battery and electronic - and the operators had no infrastructure to charge them cleanly - which means that overall they were probably much more ecologically harmful that even cars)
The former is definitely banned from sidewalks (though they are often parked there), the other is used on sidewalks quite frequently, in spite of that not being legal. They have shitty small wheels and are pretty dangerous for both rider and pedestrians.