How does Google benefit when the user decides to use one of their products? For starters, let's talk about our personal information.
There are many companies who are able to manipulate our information. Even most of the biggest internet companies do this, including Google Inc.
According to salon.com, “Google is destroying privacy and collecting your data” and "Google argues that it has the right to collect your most sensitive data." This shows how even Google takes advantage of your information for their own benefit.
Next, there's improvement of their services. Google admits that "When you use Google services, you trust us with your data. It is our responsibility to be clear about what we collect and how we use it to make our services work better for you.”
To sum it up, you are never really safe when it comes to online privacy. Even the biggest companies that you would never expect to take of advantage of personal information will not protect you. Always be aware of who is seeing your information and be careful while making an account online. You've been warned!