I still think the biggest issue in terms of bitchute for its general usage is just its content. It has the gab issue (albeit not nearly as bad) where its all the banned or non mainstream people go. So it gets all the low effort mouth breathers, in this case its youtube /pol/ack rejects.
Which in of itself isn't the issue, the issue is there isn't enough regular everyday content yet. So the monkeys scream and throw shit are either default top billing or omnipresent. It just creates a loop where that is the only content there will be, and attracts more of that same content. Any one else who goes there will get drowned out. You won't see people going there for mundane or calm shit. No one going for recipes or fun little factoid videos. Which stunts growth and outreach.
If I wanna see a video about the history of Han China, how to bake a certain kinda cake, or how to repair my computer, I am not gonna go to bitchute for that (at least not currently).
That and the lack of apps for mobile on apple or android is a pain.
One last thing that
@oddish has pointed out in the past. Is that youtubers are just as guilty of not helping any other platforms grow. Many don't bother even having backup channels on sites like bitchute when it auto archives shit from YouTube for you. So they only stay on youtube, and don't even try to help anywhere else grown in any measurable way.