Despite what some people are claiming, Corsair's RGB keyboards are currently limited to 512 colours. This has been proven beyond any shadow of a doubt and even admitted by Corsair. Why people continue to claim otherwise is beyond me.
In my opinion, the actual fault isn't particularly important. The real issue is Corsair's failure to disclose it prior to the product's release, refusal to commit to a timeline for a fix and their false advertising which continues to this day. It's extremely likely Corsair new about this issue before release but kept quiet so it wouldn't hurt sales. There was absolutely no mention of the problem from Corsair until a user discovered it several weeks after release. Corsair attempted to dispute the extent of the fault and deflect criticism until it was proven beyond any doubt. They claimed they would release a fix within "a couple of weeks" but four months have passed without any sign of it. Their latest update has no mention of a timeline, simply a promise to release a fix "when it's ready".
Even worse, Corsair continues to promote and advertise the product as being capable of 16.8m colours. It's featured prominently on advertisements and product packaging. Corsair hasn't even removed it from the product page on their own website! They have continued to make false claims in advertising MONTHS after they were forced to admit the existence of the fault. This is blatant fault advertising and shows a serious ethical deficiency. I'd really like to see Linus cover the story after advertising the keyboards so heavily on his channel.