This is a significant move, but a welcome one, in some respects.

Apple has begun to crack down on tools that app developers use to monetize and grow their applications, including incentivized video viewing and rewarded social sharing, as well as discovery tools that allow users to find apps inside the games they’re already playing. The move will have a significant impact on the app industry as a whole, and will serve as something of a “reset” in terms of how apps can achieve growth and scale.Apple Begins Clamping Down On Apps Rewarding Users For Social Sharing [techcrunch.com]