Let’s assume for a second the developer isn’t corrupt and is only spending the money on actual development. Is it even possible to spend that much money making a game from scratch?

Civ6 has districts. Instead of having all of a city’s buildings existing in the city center tile, the city builds specialty districts that occupy a hex near the city. For example, a science district placed near some mountains will house the city’s library, university, and research lab.

I think the districts are a fun addition because it exposes a civ’s infrastructure to attack. You can pilliage an opponent’s districts to temporarily cripple them and you get some decent loot in the form of gold, science, culture, or faith.