Personally I have seen a few over the years come and go. Podcasts (Adio and Video) for example often tried to use youtube as an additional channel, but still maintain their websites and RSS feeds.

It seems these days, most Youtube creators are at least somewhat aware of the problem and have websites, discord channels, patreons etc. While I still think many would struggle if they lost their youtube access suddenly, they do have additional channels to reach out to at least part of their audience.