I don't consider Google a monopoly. I figure many "free market people" define a monopoly pretty strictly. They're not forcing me to use their browser, search engine, maps, email, or many other services.
However, they do have a disturbingly high level of market dominance. So seeing as I am a part of the free market (after all, the "economy is us"), I have opted to minimize my use of Google products and services and encourage others to do the same. This wasn't the tipping point for me; I've been advocating alternatives for quite some time.
I don't want Google punished with anti-trust laws if that can be avoided. I'd much rather see users apply corrective pressure. Of course, that assumes users appreciate the importance of their privacy, which makes this a lengthy game of messaging and persuasion.
The number of egregious examples of their centralization backfiring against the freedoms within the day-to-day life of internet users keeps growing bigger at a seemingly exponential rate.
The barrier for competition may be high but history is littered with examples of giants withering under their own decision making. Nor will they forever be immune from antitrust laws.