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So a competitor to Google with a national market share >50% accused Google via phone makers of being anti-competitve. It's like Microsoft complaining that Apple doesn't pre-install Windows on Macs.

However, Apple does allow the end user to install Windows on a Mac, and Google allows you to side load apps and app stores. Yandex could pull an Amazon, fork and install their own apps. Perhaps they have seen how well that worked for Amazon and thought they would go complain to Mother Russia that an evil American company wasn't playing fair.