I'm not sure exactly what you mean, but most of the possible meanings I can think of aren't ones that would really stop us from having google be an (unfortunate) local maxima of search for too long.
I am thinking of laws that make it unlawful to publish certain links with an arbitrary property (containing or linking to copyrighted material) or laws that prohibits it to publish the result of statistical analysis (the whole auto-suggest debate). Note also that everytime that Google changes its ranking algorithm, some companies complain because, as they paid for SEO, they feel entitled to a high google rank.
