mastodon's official instance is mastodon.social
lemmy's official instance is lemmy.ml
pixelfed's official instance is pixelfed.social
what is peertube's official instance?
im looking to upload videos without the fear of my content getting deleted because the instance is closing. and i mostly prefer to use the official instances of fediverse enabled social networks.
i read about peer.tube on the faq, but signup is not available yet.
There is no official instance. framatube.org is the instance running by their developers, but it's by far not the largest.
You can get an overview at https://peertube.fediverse.observer/list about all existing instances, but PeerTube-instances are rather not general than in case of Mastodon or Lemmy.
If you want to be sure that your content will never be lost (and that means to be aware about the risk behind that on the other hand!), you should rather choice blockchain-based services like Odysee instead of federated services.
To avoid losing content on PeerTube, you can (home)seed your videos via BitTorrent-torrent clients that support WebSocket like BiglyBT or Webtorrent. So if an instance goes down, your content will still be available via P2P. But protection from depublication really isn't a strength of PeerTube just like the rest of the Fediverse.
Anyway tube.tchncs.de I would trust mostly to stay for a very long time as these guys are Fediverse-enthusiast.