tbh, I know little about the capabilities of the Great Firewall. Maybe it already is possible to circumvent it with a VPN or an anonymity network like I2P or TOR. Also don’t know if they block per IP or in blocks. Possibly hosting the peertube instance on public cloud infra would make it difficult to block if the IP changed at certain intervals.
Hosting peertube could however provide dissenters with more options than youtube.