When you start producing media content, you become a media company regardless of what you call yourself. With search and advertising, Google was and still is a

When you start producing media content, you become a media company regardless of what you call yourself. With search and advertising, Google was and still is a services business. With the ventures in other areas, they are often entering the markets as media producers in competition with those they used to serve. The reason for branding these ventures in different names is not to confuse consumers and markets in general (so when you ask a random person "what does Google do?", they can reply "search ...oh, and adwords."). In due time, the ones that become successful will be affiliated with the parent company (Google) anyway.