It was very polite, and props to them for that. But that doesn't mean there were no threats.
to use the Ubuntu trademarks and Ubuntu word in a domain name would require approval from Canonical... Unfortunately, in this instance we cannot give you permission to use Ubuntu trademarks...
This has a big "OR ELSE" implicit in it. Requiring means enforcing.
Although I still wish Canonical was more transparent about who gets to use its trademarks and who doesn't: https://bugs.launchpad.net/ubuntu-community/+bug/394328
sp332: You're right, although it's not clear to me that this definitely is not a violation. I hope it isn't for the sake of free speech.