I'd only accept those video uploads/uploaders I consider quality content.
Cool, I like that idea unironically. So how are you going to do that? To accept only "quality uploads" you would have to somehow know, ahead of time if the uploaded content is acceptable. Sure maybe you have a white list but have fun maintaining that.
Okay so different idea maybe you let people vote on the video somehow and delete videos that are deemed poor quality. Great! So now you burn through writes instead of storage itself which is probably desirable though it only lessens the need for more drives. There's a flaw in this system though. How do you prevent a community from removing a video that's been voted to be poor quality (IE fake "bad" reviews)? Are these videos gonna be manually reviewed? Manually reviewing would have the same immense maintenance problems as a whitelist so again have fun maintaining that.
My moderation point is that with a video service you are forced to "watch" the content in the video in order to properly moderate (though you can just block people of course). You could have a bunch of filters like YouTube does to determine if your video should have ads and whatnot or you can rely on the community (or both).
The main issue with it is that we want to prevent "bad content" that being very poor quality content to skip being all detailed. To do that kind of filtering really requires some form of community review of the content as it's infeasible to have it all manually reviewed. If you have a community review process you open the door to mass reporting and the like so you cannot simply automatically remove content if it gets a lot of reports, it must be manually reviewed (by watching the content) to ensure it's fair to remove it. Lemmy, at least in my usage doesn't have this desired "bad quality" filter outside of up votes/down votes which notably don't remove the content (and so doesn't remove the immense storage requirement)