The problem is the term quality would be used to block out certain creators. The definition would wind up being vague and/or arbitrary.
What one person thinks is quality may not be quality to someone else. In a way that's a niceness of YouTube. We can each upload what we think is good.. or bad.
Even then if a video goes big viral (which is arguably something a creator may want), the bandwidth costs could skyrocket.
Then it's like: maybe we need CDNs and more storage and boom now it's even more expensive. I just don't see fediverse video working great long term without big money to back it.
I remember seeing a startup at one point that wanted to put mini-CDNs in people's homes. Small black boxes that would automatically be a CDN not just for your home, but the whole area. Of course, sites would have to use their CDN network, etc.
I actually thought it was a really interesting idea. Almost like federated CDNs.
Imagine if every Xfinity router has a built-in 16TB CDN: it would be an interesting way to possibly change how bandwidth works and makes it back to the DCs. Most popular stuff would be closer, faster.