Oh, difficult to know the motivations of people doing bad things, philosophical, maybe...
Anyway, this is not the first and won't be the last. In previous situations I've seen people with theories that it would be some dev attacking in order to relay operators and other devs could think of solutions for an attack like this.
Anyway, it will be gone... Eventually a solution for this will be found, or the person will stop using resources to prove nothing.
