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Lots of stuff done with computers isn't useful, but people are curious.

that is true

Statistics can provide very interesting information. With current amount of data available in the Internet, data collection is almost free, the only cost is to create an algorithm that analyzes the data. In this case the application is useless , but for example imagine a program that analyzes skin pictures looking for skin cancer. That would allow a much faster diagnosis, which is crucial for treating cancer.