its not just the k70 anyway I have one of those wich from new had same issue, a k95 and the k68. all three are cracked on all key caps. two of wich arnt even year old
they wont give you replacements ive tried they will give 5 because you know that helps. So dont bother just give in and spend even more on new pudding keycaps elsewhere and never buy this brand again later on.
Also ive debated on doing a youtube vid on this and also buying new ones and showing they are cracked right away out of box.
I wish I never bought these keyboards