@paul @Gargron @selea That arguments makes no sense, any modern computer or phone uses hardware to play back videos, and this hardware is extremely efficient. E.g. Phones can easily play back 20 hours of video these days on single battery charge.
Anyway, this should be a client thing and settings in the client to allow or disallow playback or autoplay of videos, with size limits and probably other options, like don't autoplay on cellular connections.