Amiilog does not collect any of your data. The only data the app stores are your settings and your Amiibo collection. Those are only saved locally. No one, other than you, has access to this data.
For analytics Amiilog uses TelemetryDeck in order to collect information that can help me make better development decision. You can turn off analytics in the Settings.
If you have any question, do not hesitate to send us an email at email@example.com