Currently, I also post my videos to my website and the video files are hosted on vimeo. It's a nice system so people can watch ad free without all the YouTube nonsense. This also allows me to post to Flare and other Nostr related services.
Even given this choice though, the VAST majority still use YouTube because it's so convenient. Hopefully as Nostr apps improve, and hosting your own videos continues to get easier and cheaper, this will improve.