Disclosure: I work for Microsoft, but not in the Windows Phone division.
[0] https://play.google.com/store/search?q=facebook&c=apps
It looks like only the official apps have the official name and the other things are just add ons or silly, small value additions to Facebook, Chrome, or Firefox.
Having said that, that is a shit load of low quality crap, but all app stores have junk like that including the iOS app store.
I agree that the Windows App Store examples are way more egregious, but some of the apps in the Google store are nearly as bad. Top right among the Facebook examples is especially deceptive.
Compare that with the Windows Store screenshot where there's literally no way to tell which is the real one.
The existence of this problem is shitty, absolutely, but on Android and iOS there exist viable, discoverable workarounds. On Windows Store...
Apple seems to have done a good job hiding the cruft, at least for "top-100" searches of "companies you hear about on the nightly news" (Facebook, Vine, Snapchat, etc.). When my mom searches Facebook on her iPhone, she's absolutely going to get the right app. Based on these results, I'm not at all convinced of that if she were an Android or WP user.
In order for Microsoft to succeed in this market (and to satisfy its customers and legitimate app developers), Microsoft has to step its game up, in general, as high as possible, not settling for whatever will be perceived as about as decent as Android.