yep sorry, the Dropbox reference is a long-standing HN inside joke about comments like these. You can probably search to find the whole history of this reference, it's rather amusing.

Now now, a casual reader might mistake your grimness here for some personal interest in Dropbox's success despite its obviousness and ease of replicability... .

I know the meme, which is why I was wondering, haha :) It's also the sort of thing that could've been meant entirely sincerely, in line with the comment of the person you were responding, being particularly painful to me as I've always had a massive mental block with Rubiks Cubes!

Dark [Rubik's] Magic that they are.

Mentioning Dropbox is the key to it being sarcastic.

Like someone saying “less space than a nomad. Lame.”