Videos take up a lot more resources than text or images, and they're much harder to moderate, so PeerTube servers tend to be more careful who they grant accounts to.
The owner of the server is the one paying the bills, and they don't have Google's limitless resources. On the flip side, PeerTube servers are ad-free and much more privacy-friendly than YouTube/Google.
The owner is also legally responsible for content.
Basically, be considerate of the server owner when uploading on PeerTube!
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