It is funny that you think google would not be as restrictive - if they feel they can do it without losing market share.
Look at what they're doing on youtube now. It was all free and easy on the way up, now it is dominant - and suddenly they iron fist comes out.
What keeps these companies honest is several market leaders fighting each other to please us, not lemmings running to one platform.
any app that threatens the google business model will not be allowed on android, if not now, then later, after you have nowhere else to go.