:P

Several reasons, for one, Rubik's brand cubes are like the worst cubes of all, for two, when his patent/copyright/whateveritwas ran out, he tried copyrighting the colorscheme to avoid other people selling

Chess is a sport, so yes, absolutely

Why would you ever promote any Rubik's brand product?

well, I guess I'm kinda late in responding xD

And then his company went and became the most hated thing among cubers xD