Not so trivially as it seems. I use wireguard from Russia despite their efforts to block it. It needs some tricks to connect, but it works. I believe that openvpn will work too with those tricks.

> Everybody should use something standard and indistinguishable, like QUIC, DTLS or TLS1.3, for their transport layer.

Let them first learn how to block wireguard properly. No point to show them the full scale of the problem they face, so they could get more funding. :)

On a more serious note, it is whack-the-mole game, the idea that sounds like "everybody should use X" for some value of X is not a good idea. Everybody should look for their own way to bypass censorship, and they should do it with as much creativity and tech skills as they have.