The site has several pretty bad design issues. Aside from not having an image of the thing they're trying to convince you to support, the page is unreadable in dark mode, and uses a laggy mouse cursor that feels like I'm back on Geocities.

You'd think that, given the nature of this project, that these sorts of optics would be something that team would be more capable of handling.

https://equal-earth.com/equal-earth-projection.html

You can get this with a few clicks

Equal Earth is an equal-area (equivalent) projection. Shapes, directions, angles, and distances are distorted and stretched north-south in tropical and mid-latitude areas. Nearer the poles, features are compressed in the north-south direction. Distortion values are symmetric across the equator and the central meridian.

and there's a paper but the link requires access

Edit: I never said it was enough.