Winner-take-all domains are intensely competitive.

If you're playing in a domain with winner-take-all effects and you're not playing to win, you'll lose, because someone else will play to win and push you out.

Winner-take-all is effectively an infinity.

Infinities mess with normal analysis.

If you are wrong about an infinity then you are out of the game.

Some domains look winner-take-all but actually aren't.

But if it is, and you act like it's not, you'll die.

So you have to assume it's winner-take-all just in case.

The tech industry acts like every domain is winner-take-all, just in case.