FOSS server software shouldn't be seen as a platform. It should be seen as software that can be used to create a platform. Federation makes it technically a platform but just barely. Mastodon is barely a platform - mastodon.social is, and kolektiva is a different one.
PeerTube is software you could use to make a video streaming website like Nebula.
To me the ideal use of PeerTube would be if studios adopted it as their publishing platform. Publish to their instance, syndicated globally. But, they are so hardcore on licensing that they will never adopt a platform that doesn't have complete control over where their media is distributed. The lack of a method for monetizing videos on PeerTube is also like the black mark for a video platform. But, the maintainers of PeerTube are ideologically opposed to monetization lest the toxin of advertisements taint the platform.
The legal landscape of media publishing is filled with antiquated deals from broadcast days for regional control. That has changed marginally with the adoption of streaming.
AAA studios will never just put their videos on the internet. This is a prime example of somebody ignoring the social and political aspects of a field and focusing only on the technology. The reason Disney doesn't put their videos on the internet for free-to-the-user viewing IS NOT because they lack server software.
PeerTube is software you could use to make a video streaming website like Nebula.