>> whether the brands could be confused, i.e. whether they cover the same 'class of goods'
>By threatening to sue, Kik implicitly asserted that that's the case. Oops... muahahah.
It may well depend on what classes of goods Kik have trademarked with this branding - while they may currently be known for some shoddy messaging app, they may have also trademarked "Kik" in a variety of places/contexts.
A long time ago, there were a few articles laughing and pointing fingers at Mick Jagger for filing trademarks on his name in a variety of classes involving soap and perfume. Lawyer-type back talk was that he did this merely to prevent someone else from doing it.
I still think Kik are behaving shittily, though