I agree. Google makes android so they can stay the default search engine on the device in your hand and sell advertising so it can be revenue neutral or slight

I agree. Google makes android so they can stay the default search engine on the device in your hand and sell advertising so it can be revenue neutral or slightly net-negative and they don't care. Microsoft would have to make actual money to make it worth it re-entering and it's not a high margin market (well not true, it has a high margin market but that's Apples side and good luck competing with them).