Use of a CDN is pretty much unavoidable for a video creator, self hosting or not. That's to say if you do self host and avoid a CDN but still have those view numbers then it'll end up costing you a lot more than if you did use a CDN like Cloudflare.(It's still hosting). It just moves the costs around. And also makes the viewing experience worse. So it's pointless.

Blossom doesn't change any of this. With those view numbers I quoted *someone* is on the line for $50,000 or more per year, whether you self host or not, whether you use blossom or not, all the same. This is core infra, like electricity grid layer.

Your second point is bang on. Though "We have no audience so you won't have to worry about CDN costs" isn't a great sales pitch for creators.