What he said.
This guy said it best...
I thought Android was open source? What does Google have to gain from there being more Android devices other than more usage data and more integrated/easier ad placement? Isn't that what they make their money off of? It seems to me Android is the ideal way for them to get data and sell ads more effectively, but they would still want that opportunity from every other mobile platform as well. Their goal is more data mining and ad sales, they aren't interested in dominating the smartphone market.
This guy said it best...