In case anyone is interested in existing FOSS alternatives:
Auth0: https://openaltfinder.com/alternatives-to/auth0
Salesforce: https://openaltfinder.com/alternatives-to/salesforce
Hacker News new | past | comments | ask | show | jobs | submit Hacker News new | past | comments | ask | show | jobs | submitAuth0: https://openaltfinder.com/alternatives-to/auth0
Salesforce: https://openaltfinder.com/alternatives-to/salesforce