AllTheKarma

https://en.gamegpu.com/game/gta-6-topped-the-list-of-the-most-expensive-games-in-history-that-have-cost-over-2-billion-in-development

Here's one source. Just Google game development costs. This source is backed by others, it's just the first in my search that I saw and clicked on. Games are fucking expensive to build and market. GTAV is 250m according to this article.

Edit: does this work? I saw Genshin, which I've never played, is actually almost a billion rn which is insane for a F2P anime game. Wild.

Games are also a billion dollars to produce and market nowadays. Back on SNES they were like 500k.