Sadly when you get to use their products they may ask you for Passport/ID and a selfie through kCheck[0] like they're a bank, as you can see at the app page[0].
In their website[1] you can read about their true "privacy" behavior:
identity verification procedure may be triggered in the following cases (non-exhaustive list):
- forgetting an Infomaniak account password (user account)
- forgetting a login email address
- deactivation of double authentication (2FA)
- unlocking an Infomaniak account
- during the first transfer of revenue for the product Ticketing
- when ordering a product (suspicion of spam or fraud, brand name, etc.)
The same page also says the process may require mandatory geolocation, choosing ID card or passport, photographing the document, and taking a selfie with it.
[0] https://play.google.com/store/apps/details?id=com.infomaniak...
[1] https://www.infomaniak.com/en/support/faq/2418/getting-start...