It is so open, you can check indexes when analyzing the competition to improve your site.

Analyzing the Competition

A key step to any search engine optimization effort is to analyze the competition. The simplest way to do this is to simply go to their site and look at the code. Most browsers let you do this by clicking the “view” tab and then selecting “source.”

You competition isn?t stupid. Many sites will bar browsers from showing source code using the above technique. If your competition takes this step, is there anything you can do? Yes, there is.

Indexes

Almost everyone knows how to check if his or her site is indexed in a search engine.
google seo