You can comment using an account on any ActivityPub-compatible instance. On most platforms, you can find the video by typing its URL in the search bar and then comment it from within the software's interface.
You can import any torrent file that points to a media file. You should make sure you have diffusion rights over the content it points to, otherwise it could cause legal trouble to yourself and your instance.
You can import any URL <x id="START_LINK"/>supported by youtube-dl<x id="CLOSE_LINK"/> or URL that points to a media file. You should make sure you have diffusion rights over the content it points to, otherwise it could cause legal trouble to yourself and your instance.
You can interact with this via any ActivityPub-capable fediverse instance.<x id="LINE_BREAK"/><x id="LINE_BREAK"/> For instance with Mastodon or Pleroma you can type the current URL in the search box and interact with it there.
You can subscribe to the channel via any ActivityPub-capable fediverse instance.<x id="LINE_BREAK"/><x id="LINE_BREAK"/> For instance with Mastodon or Pleroma you can type the channel URL in the search box and subscribe there.