[trogggy]

All those offended by the funny (and a little bit scary) prank should demand a refund.

Oh wait...

This didn't inconvenience me in the slightest - and the takedown notice was pretty funny.

It was totally forseeable, though, that some people - perhaps a small number - would be seriously inconvenienced by taking the repo down without warning. Anyone trying to update to krypton would be likely to run into major problems, particularly if they weren't especially technical.
So the big clever joke would cause problems for some users - who cares?
Maybe the repos had to be taken down. In which case a warning would help a few people.
Maybe the repos weren't supposed to go down. In which case explaining what had happened might have helped a few people.
As for 'demanding a refund' - it doesn't matter how great / mediocre / appalling TK's actions are - you can always roll that out. If you want to tell me I've had a sense of humour failure then fine, go for it, but I'm left feeling TK as an entity (not individuals within it) doesn't respect the users. If I'm the only one then that doesn't matter.