The real question is, why is it bad for Google to require Google Search and Google Chrome if you want Google Play, but OK for Apple to require their App Store if you want iOS?
Obviously you have the positions reversed then, but it's still the same sort of tying, and I'm pretty sure those are the correct positions for Google too. You aren't pushing Google apps on people who want the Play Store, you're pushing the Play Store on people who want Google apps.