Well, certainly, a transit operator should be doing their own research — this isn’t a replacement for that.
But this is excellent as a complementary new piece of data, especially one that can be gathered so frequently and easily (especially compared to lengthy transit studies)
Either transit studies should not be so lengthy and there are plenty of know ways to gather data that are less biases; or there is good reason for the length. Note that the above is not an exclusive or - there is a time and place for short studies and a time for long studies. However either way the study needs to be carefully designed to not get biased data, and this app is biased data.