If I have to spin up a keycloak instance (you forgot to say on a public-facing data center that runs 24/7) to use a single service I would usually signup with a

If I have to spin up a keycloak instance (you forgot to say on a public-facing data center that runs 24/7) to use a single service I would usually signup with an email and password, I might as well spin up my private vpn server.