You can import any URL <x id="START_LINK" ctype="x-a" equiv-text="<a href='https://rg3.github.io/youtube-dl/supportedsites.html' target='_blank' rel='noopener noreferrer'>"/>supported by youtube-dl<x id="CLOSE_LINK" ctype="x-a" equiv-text="</a>"/> 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 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 might want to <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/>create a channel by theme:<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/> for example, you can create a channel named "SweetMelodies" to publish your piano concerts and another one "Ecology" in which you publish your videos talking about ecology.
The worst-case scenario of an average person spying on their friends is quite unlikely. There are much more effective ways to get that kind of information.