PeerTube does not impose any remuneration model. This is the choice we have made, and others (like DTube) have made other choices. So it's up to you to see what suits you.
This should not be a problem with SSD disks, whereas traditional HDD should be accounted for: typical sustained read rates for a well tuned system with a 7200rpm hard disk should hover around 120 MB/s or 960 Mbit/s. The latter should be enough for a typical 1 Gbit/s network uplink.
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>.