I certainly wouldn't say it's "a lot" of Android users. The only people I've ever known who have used oversized batteries have also had rooted phones running some alternative Android distro - hardly your "typical" user. Most average Android users don't know oversized batteries exist.

And like it or not, most new Android phones don't even have replaceable batteries, so the number of users with oversized batteries is getting smaller and smaller.

A the majority of frequent international travelers I know, both iPhone and Android all have oversized batteries.

There's a whole section for them at Best Buy, they're hardly a niche product.

If it becomes commonplace to have wireless chargers in everyday furniture, less people will be dependent on extended/extra batteries.