Any company that has a lot of data in an SQL system that they want to make sense of. The idea would be that business intelligence people, analysts, the CEO, anyone who needed answers could ask a question in plain english and hopefully get a response.

The success rate was just not good enough, even for relatively simple queries. You'd probably need to adjust the query 90% of the time, and the other 10% you couldn't even really trust that the answer was correct.