Anya has no access control by default, do not expose anya without it. This is so, to make you free to choose an appropriate authentication method by yourself.
Note: Do not just turn on a bare GitHub oAuth2 Login without restrictions. Anybody with a GitHub account could access your Cluster.
There is a free access control, up to 5 Users which are authenticating against your domain. You can restrict user access by specific email, domain and other rules. It is recommended to use the specific email restriction in conjunction with the GitHub OAuth2 Login. This way, you can review all registered users via GitHub. Your users should be registered at GitHub anyway.
The oAuth2-Proxy of bitly is a self-hostet Kubernetes App, which secures the access to the app. You can specify email and domain rules, as well as turning on the oAuth2 Login via GitHub