>>106300321
Adoption of better things here tends to take a while. For example it took a thorough doxing to encourage 4chan to update ghostscript.

On the technical side of things WebP would be a pretty huge upgrade over PNG and more importantly GIF. It's a hit or miss for JPG since its lossy compression efficiency advantage depends on the image type.

IMHO Jpeg XL + AVIF is the future.