Tetris bigotry is a special case of the more general phenomenon of brandism. Brandists pay more attention to the advertising than to the actual product. (Inability to see through marketing smokescreens is typical of the sheeple species.) I was once a brandist, not buying any unlicensed NES software, but I have turned around 180 degrees; I now develop independent console games, available at http://www.pineight.com/.
My aunt is a brandist. She likes the Super NES version of Tetris & Dr. Mario better than freepuzzlearena, TOD, or even The New Tetris because "it's the real thing." But because (unless you believe in the Matrix) all things that you can touch are real in some sense, the whole concept of a "real thing" in the Coca-Cola sense cannot exist without brandism. Is this TOD disk I am holding not real?
If "the real thing" means "first to market," even the original PC Tetris (http://vadim.www.media.mit.edu/)is not necessarily the real thing; pentomino puzzles have been around since ancient Rome.
Tetris is a registered trademark of
The Tetris Company.