Comment by Brybry

The sites like tenor/giphy/klipy all convert to multiple media formats and then have meta embed properties with multiple formats.

Sites/apps like Discord sometimes consume the mp4 instead of gif or webp when embedding (and in Discord's case they're not hotlinking, I believe they're running it through their own media proxy service).

For example, <https://klipy.com/gifs/begone-witch> turns into <video> (with ARIA GIF label!) and src <https://images-ext-1.discordapp.net/external/kQT1eR3Sa6g3mZ_...>

7.1 MB gif => 679 KB mp4