There is an ongoing debate about the value of cities hosting the Olympic Games. And that's because this is usually how it works: You, the host, spend a lot of money (Tokyo 2021 was over $25 billion), it feels really good during the games while the world is watching you on TV, and then everyone leaves and you have a big bill to pay.
As I understand it, this has generally been the case for almost all of the games. One rare exception is Los Angeles in 1984, which supposedly managed to make over $230 million from hosting. In pretty much every other case, the rough value was, at least in theory, things like exposure, ego, and hopefully a bunch of assets that will remain useful to other people once the games are done.
But as I have argued a few times before, perhaps the most important hard-to-quantify benefit is this: Hosting the Olympics creates an immutable city-building deadline. Because, what could be worse than not being ready when your global guests show up?
A perfect example of this is what Paris is now trying to do with the Seine