[tshaddox]

Google just has a much broader set of products, many of which are about as close as you can get to unavoidable infrastructure for everyday life. There are always alternatives, of course, but it's no surprise that Google is much harder to avoid when they offer either the only dominant product or one of a very small number of dominant products in so many areas: web search, email, calendar, maps, smartphone operating system, web browser, video sharing, office suite, ... what did I miss?