Now, you could say they're just looking out for vapers, and think people should be aware of this. That might be true, but going back to the SFATA letter, that's NOT how professionals act. They opened themselves up to legal action.
You may be right about the proper way for professionals to act, I really don't care. I don't even care about Cloud9's motives.
This topic matters to me, but there are people and entities of various kinds out there who would rather the conversation didn't happen, at least in public. What I do care about is the end result of what Cloud9 did. That is, this topic got pushed a little further out into the public sphere, and consequently I got to find out quite a lot more about what going on with respect to Diketones.
I now know that at least one vendor, and almost certainly others, are knowingly selling juice with high DK levels, and not telling their customers. I also know that some players are actively promoting disclosure. I know of several vendors who don't add DK's, and some that publish their results. I knew a little about all this before, and suspected more, but the aftermath of C9's actions has led to my knowledge level increasing. I have a more filled out picture of the matter.
As someone else commented today, it's likely that most vapers have never heard of DK's and have no basis to even make a decision on what to do about it. I can't see taking a position that would slow the dissemination of information about DK's to me and everybody else, just because it's not the proper way for professionals to behave. Or because it might give ammunition to our enemies. That's the cloud chaser argument. I very briefly agreed with the cloud chaser argument by the way. I got over that quite quickly. Opinions change, especially in the presence of information.