Through mail, search, youtube, android they control a huge amount of traffic. They also have a clever bids system for ads which encourages people to spend lots

Through mail, search, youtube, android they control a huge amount of traffic. They also have a clever bids system for ads which encourages people to spend lots and gives them enough tracking to let them feel it's worth it. Mostly it's just the traffic though. It's at the opposite end of the spectrum from taboola say, and is probably the most acceptable form of advertising I've seen. So both customers and advertisers like it.