How? Of course asking OP to add features for a site he offers for free is wrong, but I don't think he's wrong about gif. As far as I know all the "gif" sharing sites like giphy and stickers in chat apps like discord, etc actually use webms/webps.

Gif is simply the most versatile format on the face of the planet. When you go down the rabbit hole you’ll discover this too.

Twitter for instance automatically converts gif to h264.

However there is a point to be made that iOS only grants VP9 decoding to Youtube, certain colourspaces fail to decode on Android etc. ergo gif is a safe default.