The thing is video hosting at scale is still a pain, I have a YouTube account because I have a Google account so they never nagged me to create one, and almost all their content is still free in unlimited amounts. I'm not sure I've ever paid YouTube a dollar directly even though I watch it daily.

There may be some similarities (like when they used to let people upload full movies and TV shows), but it is a big stretch to paint YouTube and Medium with the same brush.