Get <a target="_blank" rel="noopener noreferrer" href="https://docs.joinpeertube.org/use/video-stats">detailed statistics</a> on your videos (views, watch time, unique viewers...)
Communicate with your viewers using the <a target="_blank" rel="noopener noreferrer" href="https://livingston.frama.io/peertube-plugin-livechat/">livechat PeerTube plugin</a>
Get help on <a target="_blank" rel="noopener noreferrer" href="https://framacolibri.org/c/peertube">PeerTube forum</a> or ask new plugin/theme API in <a target="_blank" rel="noopener noreferrer" href="https://github.com/Chocobozzz/PeerTube">PeerTube issues</a>
While viewers themselves contribute a little additional bandwidth while watching the video in their browsers (mostly during surges), mirroring servers have a much greater uplink and will help your instance with sustained higher concurrent streaming.
Other Framasoft's volunteers and salaried members also contribute to the PeerTube project on various aspects (strategy, communication, development, community animation).