Fun!
Unnecessarily invasive
I understand to authorise the app to login to your SNS account to do something, like to post something, would be useful. But the fact you must give the app and developers a free hand to do whatever they like is wrong. As for the SNS, I declined the authorisation, and that means I am unable to use their supposedly useful functions like posting to the SNS and hence the app is less useful for me than it should be.
The interface for the registration is also poor, unintuitive (at least in the English version), and in some cases unnecessarily forcible. For example, you need to follow at least one "more" person/organisation in addition to your already registered list (when you have already an account with them) - otherwise it seems you cannot start to use the app.
The concept of their project looks good. However, the ways the app is designed and the terms and conditions are written are poor and too invasive. That's a shame.