Earlier quoted context omitted.
You don't have to convince creator's to switch , just to use your new platform as well . YouTube doesn't have an exclusive license on the content.
That's where the problem is, a lot of popular content creators have contracts with large media groups which specifically prevents them to upload to another platform.
If not, maybe even if so, that might not be such a bad thing. It would mean that if you could negotiate a deal with a single media group to upload to your platform as well you get a lot of content. I don't imagine these businesses are any happier with being hostage by youtube than individual creators.