It still disadvantages those people who want to use that service while there is nothing to perform the job. Take google recently killing code search http://googleblog.blogspot.com/2011/10/fall-sweep.html. One of the commenter's had been building their own code search platform before google did. Google entering the market meant that this was no longer viable though http://news.ycombinator.com/item?id=3112444. A new code search platform will no doubt pop up, but it will take a while to get something that works well.

This is the problem with the giant company stepping into new areas, it often leaves destruction in its wake.