Not necessarily, since it seems Google's new strategy is to create its own walled garden and keep you inside of it as much as possible.
Their mail and calendaring apps sure don't, for example.
At this point Google is big enough that generalizing about how they make money is a bit pointless, because they have a bunch of different revenue streams. The only commonality is advertising.
But that's not stopping them from signing deals to get Chrome drive-by installed on users' computers, say. Again, it's a big place. Some of it is still all about "do no evil", while other parts seem to be run by scumbags. Pretty good for a large corporation, all things considered, but not exactly all wonderful.