If you don't think building a usable linux distro is an enormous amount of work you've never actually tried to do it. Canonical (and the Ubuntu project) is an awful lot more than a few Canonical-originated upstreams.
I have built my own distro before. But that's not the point of what I said. I was saying the Canonical didn't write the software in question and that said software could be installed on any distro. Which means it's a bit of a stretch to blame Canonical for enabling censorship in China.
It's a bit like when people blame ISPs when customers use their services for piracy. The difficulty of setting up an ISP (or distro) is completely irrelevant in this discussion.
