Comment by kivle

Mostly it's about milking app sales with the app store fees. Apple for instance get's about 15-20% of it's gross profit from app store fees. For Google it has been estimated that play store fees make up about 13% of their Google services profit.

I think initiatives like this are a form of "marketing" to show that "hey, app stores are important because we protect the users. We shouldn't be regulated away."