It doesn't. There is an option to log in anonymously, which uses one of several dozen "dummy" accounts operated by Aurora maintainers to sign in. As of late these dummy accounts have been getting rate limited, leading to anonymous aurora sessions not working as expected.
A commonly suggested workaround is creating your own personal dummy account used for nothing but signing into Aurora. Google first rate limiting Aurora's dummy accounts and then beginning to instaban personal dummy accounts is significant because it represents an escalation in their efforts to force all Android users into proprietary walled gardens (Play store).
A commonly suggested workaround is creating your own personal dummy account used for nothing but signing into Aurora. Google first rate limiting Aurora's dummy accounts and then beginning to instaban personal dummy accounts is significant because it represents an escalation in their efforts to force all Android users into proprietary walled gardens (Play store).