PeerTube is a free software, not a secret formula that belongs to Google (in the case of Youtube) or to Vivendi/Bolloré (Dailymotion). This free/libre license guarantees our fundamental freedoms as users.
Except for video transcoding, a PeerTube instance is not CPU bound. Neither Nginx, PeerTube itself, PostgreSQL nor Redis require a lot of computing power. If it were only for those, one could easily get by with just one thread/vCPU.