@dmian @theowashere @buage @Tutanota @Mastodon @ecosia @nextcloud It's federated, you can subscribe to PeerTube channels without leaving Mastodon 
You don't need an account on PeerTube.
For example, search for Nextcloud using search on Mastodon. There should be two results, one for Mastodon account and the other for PeerTube. Click on PeerTube result, follow, and you're subscribed to Nextcloud's PeerTube channel 