- To make money for themselves, and to cement their market-share.
- To reduce the amount they rely on third parties to deliver the web browsing experience. With chrome they have a platform with they can rely on, and use strategically.
1) To collect data on your browsing habits, and serve you better ads, and make more money from you.
2) To generate more traffic to google properties, so that you generate more revenue.
3 ) Gathering user behaviour data for ad targetting, google search, etc etc.