People have lots of things to do in their life. That 10 minutes to use the app is 10 minutes I can't spend on my wood carving (random made up hobby). This is why I'm against these programs - statisticians know lots of better ways to get data that is less biased to people who feel like making the time to submit information. (Statisticians can also tell you what biases they were unable to account for so you can make decisions on if you need to collect more data).