I thought those random keys are always taken by bots by the time I try to activate 'em, but I was pleasantly surprised to find out that was not the case this time.
Btw, this and the key from the other giveaway were the first ones I tried which surprised me too, so I can't provide any more information about the availability of the others.

Wow, this is incredible. I am so proud of this group of people!

(And thanks for the nice giveaways too ;-) )