Actually I'm thinking in a winner-takes-all universe, the right strategy would be to spread your bets on as many likely winners as possible.

That's literally the premise of venture capital. This is a scenario where we're assuming ALL our bets will go to zero, except one which will be worth trillions. In that case you should bet on everything.

It's only in the opposite scenario (where every bet pays off with varying ROI) that it makes sense to go all-in on whichever bet seems most promising.