Slight Mixed message in the first para???
"Businesses aren't built on ideas"
and
"It won because it did search better than anyone else"
Just making the point that they did have a new idea (no idea if they tried to patent it), a different way to rank web pages, which turned out to be much better.
I think that the whole monetizing came later, as a result of being so popular as a search engine. So, absolutely agree that an idea is nothing without the people to do something with it. Just not sure you're comments are "what makes the US patent system ... so broken".
I think it the US system is not good but I think it is more to do with incentives to sue such as "triple damages" if the person you are suing were aware (or should have been aware) of the patent.
Whilst the US patent system is quite different to other countries, I think it is the difference in the court process which really creates the trolls.