I can remember being a teen/school kid and wondering why they did not test those bugged games this way before poor teen/school kid me had to buy them to find it bugged and broken. ;)
But of cause, the search space can be massive, so not always successful. Though it should find simple bugs that are often overlooked, such as illegal characters in the text fields (or in this case API calls?).
Any extra tools for getting jobs done are nice.