One interesting thing to me, is that it is pretty clear that the kik lawyers pretty dramatically over enforced their trademark. For those who don't know, the purpose of trademarks is to prevent customer confusion; essentially we don't want people to be able to sell cheap knock-offs of someone else's thing without the general public being able to easily distinguish between them. In practical terms, trademarks are "sco…
They have the responsibility to defend their trademark, otherwise it could be abused by a rival claiming they did not adequately defend it. That said, NPM could have just said, "No, stop bothering us" and the lawyers might have backed down, satisfied their attempt to defend the trademark fulfilled their duty.
This is not limited to only issuing cease and desists. Kik Interactive can offer a zero cost license for the trademark if they want to assert their ownership, but let the project continue to use their name.