Scroll up a bit and look at the charts that richkae posted. Now consider this:
A typical ICE owner goes to a typical car dealership for periodic maintenance. The dealership service department performs the maintenance and puts a sticker on the inside of the windshield at the top left corner, reminding the owner to come back in 3000 MILES OR 3 MONTHS, whichever comes first. Now, you and I know something about cars so we know this is nonsense, that car doesn't need an oil change for at least 5000 miles, probably more. But the typical owner isn't going to know any better, they are going to come back in 3 months, and the dealership is going to charge them $50 for an unnecessary oil change. And as long as they are there, how about having your fuel injectors cleaned out for maybe a little upcharge? And come back in another 3 months of course.
Now if you're dealing with a REALLY unscrupulous dealership (as opposed to a routinely unscrupulous dealership) they will deliberately overfill the crankcase, or strip out the threads on the radiator drain plug, or unplug a vacuum hose, or something else that will cause a problem but leave the car basically running for a while. I have actually had all of these things actually happen to me. So now the owner has to come back for more service. And maybe it doesn't even cost the owner anything, because maybe the car is still under the drivetrain warranty. But the dealer can still hit the manufacturer for the cost of warranty work, which is still money in the dealer's pocket.
Now, suppose the car is electric. No oil to change, no fuel injectors to clean. What's the dealer going to do to get that service revenue? Change the battery coolant every 3 months? How many customers do you suppose are going to fall for that?