Hi @fredzannarbor - Thanks for the shout out, though the “new” auth0_component above is by @conrad_bezuidenhout. 
I build this one back in January: Streamlit Next.js Component, Auth0 Authentication, Bi-Directional Messaging & Serverless APIs.
With Auth0 you can write login flow interceptors which run as small JS modules in Auth0 itself, and these can be used for all kinds of integrations and analytics, across multiple apps even. Also Auth0 has built-in user management and user activity monitoring dashboards (and much more).
HTH,
Arvindra