In their defense, they've said time and time again that their ecosystem score is not based solely on apps, but also takes into account third party accessories like speakers, charging docks, cases, etc. IOS has a lot of apps that Android doesn't and vice versa, but iOS devices have way more first and third party accessories than Android handsets have, and it's not even close.
This is also why they give the Surface a lower ecosystem score. I think the SP3 got an 8 on its review for ecosystem. Sure it has every windows program ever that you can install, but the amount of first and third party accessories you can get for it is dwarfed even by a popular android tablet, and basically zero compared to an iPad.
Personally I'd rather they split the two up to avoid this confusion.