The Mammoth app introduction screen. It has some explanation text "You will be signing up to moth.social, a server operated by the creators of this app, but you can easily switch between or create new accounts at any time.", a button "Create an Account" and a link under that button "Or sign in to an existing community?"
https://files.social.n8e.dev/media_attachments/files/109/942/067/639/373/700/original/f6c7519fb8ba09e3.png