However, the paywall (for all of these auth services) ends up being quite steep for the couple features that matter for a non-hobby app, such as custom domain name and MFA (totp or hooking up to an external SMS service). Unfortunately it makes these features expensive when you are starting out (paying ~$40 a month for only a handful of users, sort of thing...).
It is nice to see more and more of these services allow you to take out your data and migrate though - including the self-hosted options. Being vendor-locked for your user account data is a really big deal in my opinion. It often means having zero good options if the vendor decides to rake you over the coals one day.
