Storage is the relatively cheap part of video hosting. A single 20MB (tiny) video with 10M views is 200TB of traffic. Multiplied by hundreds of thousands of videos, that becomes a massive amount. Nostr is tiny, so it is easy now, but to scale will require something new.
Discussion
I really dont get why people here on nostr do not want to admint we dont have good solutions for almost nothing, just workarounds.
The only way we will find solutions is if we admit there is a problem.