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WebRTC is not blocked. I do see some protocols trying to masquerade as WebRTC, but for some reason it is not popular.

A primitive way to bypass the censor is just to connect to your VPS with RDP or Chrome Remote Desktop (which is WebRTC underlying) and then browse the Internet there. But it needs a very powerful server and is quite slow.

Might as well actually make calls. Malformed Opus going up, malformed h264 coming down. It can be multiplexed with something like a livecam feed.

Due to the specific ISP environment in China (massive NAT abuse, very limited public IP access, ISP actively dropping anything that does not look like HTTPS to ensure QoS), any P2P based protocol in China is generally unusuable. They are not blocked per se, but they are mostly non-existent.

Yes, I know BitTorrent network in China is huge thanks to the weak DMCA law enforcement towards individuals, but having no practical legal consideration does not mean it's enjoyable to use.