It’s actually more a bandwidth issue, bandwidth costs me more than hosting does (uploads go into the Amazon cloud), I am old enough to remember the old days when that was standard and some people’s sites went under due to bandwidth leeching.
That and historically there have been issues with just embedding images, them upsetting people with autoplay, surprisingly them with volume/dialog, etc.
Which is probably why they’ve done best on sites just for short videos like Tik Tok (and Vine… RIP)