We have a policy for contributions related to security. Please refer to <a target="_blank" rel="noopener noreferrer" href="https://github.com/Chocobozzz/PeerTube/security">our security policy and advisories</a>.
We recommend you to create your own digital identity, without using "PeerTube" for your project (software name, website domain...) to not confuse people about who is behind the website/project.
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.