The chances are that Google will only go after infringements that help put more money in their pockets. Over the past few years they did significant damage to the rankings for small e-commerce sites to the point where they can no longer compete in Google search results with the big stores. That drives them to AdWords, which is something that many cannot afford.
If they honestly wanted to clean up search results, they should go after sites using deceptive practices such as those you pointed out. However, that would probably take a manual effort, which means they are not likely to do anything unless someone reports the sites to Google. You can do that through a Webmaster Tools account.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin