Nile CEO here. Nile will promise to make the experience of moving out of Nile really easy. This is one our core product principles. We want users to stay for the value we provide.
Nile user permissions are optional. You can decide to use any third-party provider for it. We are in the design phase for permissions at this point. We would love to get your feedback to understand more about your concerns https://github.com/orgs/niledatabase/discussions/159