It's the reason why we encourage developers to use the <a target="_blank" rel="noopener noreferrer" href="https://docs.joinpeertube.org/contribute-plugins">PeerTube plugin API</a> to create their own monetization system.
<a target="_blank" rel="noopener noreferrer" href="https://docs.joinpeertube.org/use-watch-video">Share</a> the video or the playlist URL/embed with attributes (automatically start/stop at, loop enabled, muted...)
Nope. In December 2020, the 618 instances listed on our <a target="_blank" rel="noopener noreferrer" href="https://instances.joinpeertube.org/instances">public index</a> host ~1% videos tagged as NSFW (i. e. the content is sensitive, which could be something else than pornography).