If you are not signed in to the Facebook empire, Instagram will not show you any content. You can get a little (photo posts, abbreviated profile) if you are signed in to facebook but not Instagram, but if you have opted out of the whole ecosystem you get a login screen on instagram no matter what. This is my experience. Easily reproduced by using a private browsing window. I argue that walled off content not available on the open web should not be FPP material.