"'Yandex', whatever that is" - Yandex is a $10B public company, a legitimate innovator and the top internet player in Russia. Ever heard of that country, or is it yet another "whatever that is" for you?
Not to mention $10B is probably less than the amount Google alone has spent developing and promoting Android. Please explain how their direct competitor should be entitled to piggy back on that work for free.
Edit: apparently they even have their own 'Yandex Browser' based on Chromium. Shameless.
Nobody forced Google to release Android under open licenses and by doing so they certainly didn't get green light to abuse monopoly.
"I will open source my software and see that it only does me good" - that's not how it works.
However, Play Store is not open source or released under an open license so if you want to use Android to spread your crapware you don't get to complain that Google doesn't want to license you their app store. They have no moral ground to stand on.
Did they?