you can make millions if you play competatively

Sure, but you can make millions doing anything at the top level... So many better things to dedicate your life to IMO.

its about predicting your opponent, and reacting to his move, something most brownoids can't possbily do (you know, use their frontal lobe)

But it isn't anymore. At the highest levels, you literally just memorize the first half of the game. Then after that you just have the computer tell you the optimal strategies for mid and late game, and memorize those too... Because no human can beat "stockfish" the chess engine, so all the best players just sit there and memorize what the program would do.

At least prior to computers, the chess players would need to actually read chess books and think about the optimal moves themselves, but with computers, that's all sub optimal. Why figure anything out if you can just let the computer do the thinking for you? Because you'll never beat it, and you'll never beat humans that are using it, so you're forced to use it.

Ultimately, it's too simple of a game that chess engines have effectively "solved" it.