I've been in testing for a short time, it hasn't been fully released yet. Gg makes it easy to find the best profile pictures and banners to use on Discord, Tiktok, Twitter and anywhere else. You can coordinate the banner to match your profile picture, show off your favorite game character, or display a cool illustration. But the server I'm on and which has had a level 3 boost for months doesn't have this feature, and Discord doesn't tell me that I can add an animated gif unlike the dead server.
This 600x240 banner can be as simple as a solid color or have an eye-catching animation to match an animated server icon. I raised exactly the same concern in a much older post, compared to the animated server icon on which users always hover their cursor to access the chosen servers, a banner over which the cursor is hovered is something that will rarely happen, if at all. As this feature is implemented, Nitro users will have the option to create and upload custom profile banners that reflect their interests or personality.