Wow, that pricing is awesome. Once you have email verification, social login, and a C# SDK, I will switch away from Auth0 in a heartbeat.
This being open source is a HUGE draw. It means I don't have to trust you as much, because the code is out in the open for security researchers to poke at. Do you have a bug bounty program?
I assume this works via an API as well, not just web based sessions? My use case is an online multiplayer game written in Unity.