One large financial services provider even told me that their "policy" was to allow 3, 4, or 5 characters as the last part of the domain. So .ninja is A-OK. I pointed out how ludicrous this was, and they told me it was their "policy" again, and that's why Australian Super doesn't have any of my money.
Wow, no country codes? I could understand a restriction dating from before the great expansion of TLDs, but expect it to have a 2 in it.
Actually I wonder then if it was 2, 3, or 4. I think it was, because I remember thinking that .wiki would have been okay.
Either way. Arbitrary and stupid.
But don't activate an account without e-mail verification. I got a random account on Deezer because someone signed up with my e-mail address; they probably got it off a spam list. But it kind of implies that Deezer didn't do e-mail verification before letting people use their platform.