This is just an extra information injected in PeerTube HTML that is required by Twitter/X. If you don't have a Twitter/X account, just leave the default value.
<x id="INTERPOLATION" equiv-text="{{ instanceName }}"/> administrators allow you to publish up to <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/><x id="INTERPOLATION_1" equiv-text="{{ videoQuota | bytes: 0 }}"/> of videos<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/> on their website.
With <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/>Do not list<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/> or <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/>Blur thumbnails<x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/>, a confirmation will be requested to watch the video.
Enabling it will allow other administrators to know that you are mainly federating sensitive content.<x id="LINE_BREAK" ctype="lb" equiv-text="<br />"/><x id="LINE_BREAK" ctype="lb" equiv-text="<br />"/> Moreover, the NSFW checkbox on video upload will be automatically checked by default.