Hypothetically they could be using an account / login process to allow them to filter out measurements from devices that for whatever reason (hardware / environ

Hypothetically they could be using an account / login process to allow them to filter out measurements from devices that for whatever reason (hardware / environment / etc) to be sending low quality data. Alternatively they could have used device id without having the user setup an account but that actually feels more intrusive. Not saying that is a reason but it could be one of the non-user visible rationales. I too would prefer an anonymous option