They built a bot which can answer any number of questions, each of which would have needed some analyst time. Given that the analyst rotation was an entire day once every N weeks, and the bot took 1 day to make, this is going to pay for itself after 1 week.

This all assumes that the bot doesn't need tweaking for every answer — i.e. it gets at least some answers right without needing modifications to the bot — which appears to be the case based on the examples in the post.