My kids certainly use their fire tablets. I think the android tablets get used a lot outside of the US, which is where most of them are likely sold.Yes they’re being used, as far as my own experience goes. I bought an iPad for myself but for my wife and parents I’ve bought 4 Android tablets.
They get used much more than my iPad though I do have more devices in general to choose between.
Since they aren’t in the Apple ecosystem the benefits of iPad mean nothing to them so it’s not worth the premium. The combined cost of all their tablets is less than my single iPad.
I suspect Android tablets get used more often than iPads. No one’s buying Android tablets to look cool. No one’s upgrading them every year to show off. They get bought to get used.
I think people in America, Europe etc have largely moved past the age of tablet discovery. The time when people bought a tablet for the novelty factor and put it in a drawer for years. People who buy tablets today in these places are likely upgrading for older devices and have a use case for them.