The idea is interesting, but there are some disadvantages of the app itself (see below). Maybe developers can read this and implement some changes.

- the phone should have non-obscured view of the sky. Thus having a phone charging and logging the data while it is on the desk inside a house doesn't work that well (red or orange indicator of the measurements quality, even near a big window).

- speaking of charging, there are no settings which allow to instruct the app to be dormant and automatically start recording when phone is charging.

- Account and login process is needed to upload the collected data. Why is it even the case? Can't the data be uploaded anonymously with just some unique phone identifier, or without one just relying on coordinates and other GNSS related measurements. Data can be cross-checked with others nearby and outliers can be removed just from that. There is no real need to know my name, email and create a leader-board or at least have an option of anonymous upload.