I don't know the disconnect between HN and the real world. Auth0,Okta, AWS Cognito, ... are all making good money, so clearly real costumers are paying them rea

I don't know the disconnect between HN and the real world. Auth0,Okta, AWS Cognito, ... are all making good money, so clearly real costumers are paying them real money. I'd recommend using something like Fireabase as the front end, that issues JWTs etc., but the actual user database to still yours. Firebase calls this custom-auth. That way, you benefit from their client libraries in multiple languages (Js, Swift, Kotlin, ...), and also from the reliability and security of their server side, but since the actual DB is yours, you have the option of moving to another provider, like Cognito, if need be