how come this isn't being used by activitypub to offload server work?
you dont even have to use ffmpeg, just dump the video directly and get encoded videos back...
if your server is NOT running FFMPEG, that is potentially more resources available for actual server work
Because ActivityPub is the same thing as HTTP, a protocol for exchanging information. Basing a protocol around the idea that you send data to a closed-source platform goes against the whole idea of creating a open protocol in the first place.
Not to mention it goes against the idea and culture behind Mastodon as well, as bunny.net doesn't seem to be FOSS at all.