Yes, at certain scale you likely have deals with many CDNs.
At even higher scale (YouTube, Facebook or even Netflix ) you are going to be putting content caching servers at the local ISP PoPs : it is mutually beneficial to do so .
At even higher scale (YouTube, Facebook or even Netflix ) you are going to be putting content caching servers at the local ISP PoPs : it is mutually beneficial to do so .
It is hard to directly compete on long-form video because of audience and content depth advantage Google has with YouTube.
There are successful niche players who are fairly large (like Vimeo or Twitch or even OnlyFans) who focus on specific markets that don't require social network advantage like corporate or smaller segments etc.
For general purpose media, creators are going to focus on the platform with most audience and vice-versa, very hard to break that.