Is that... just like Adobe® Flash®?GIF is a copyrighted technology. Any web site wishing to use GIF images has to license the technology (or face law suits), hence PD alternatives were developed (PNG, though it doesn't support animation).
In case anyone wondered why some sites don't use or allow GIFs.
I thought GIF is not allowed because it is too distracting. You can't focus and read static content when there is something nearby "flashing" on and off.