Somehow, someone still lost $500k against that bet. Not that kind of 'obvious' then.
Also, do you have a link that someone lost $500k? Because it's not in the original link.
Any money you win gambling has to come from someone else, it doesn't just appear.
Yes, generally both sides of the book balance (minus a cut for the bookie). But there's not automatically another exactly opposite bet of the same size lol.
Like if you say "someone is at the door", you don't literally mean that exactly one person is at the door.
And someone at the door? If you see 3 people, you don't say someone. You'd only say someone if you're expecting it to be one person (which it usually is knocking at a door).