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I'm not sure about that first part, some of the biggest games like gtav is an embarrassment in the concept of never trust the client.

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GTA V is an exception because it's so easy to cheat in. I believe it's peer-to-peer with no verification among peers that what happened should actually have happened. It's basically impossible to secure that.

I suppose that was an intentional choice, I can imagine running the amount of worlds that GTA has (iirc you only have up to 32 or so players in a world? Something like that) doesn't scale well cost-wise. IDK if AWS and co were up for the task yet back when. But since you earn in-game currency, not having a central authority check these things is... an interesting choice.

I suspect GTA VI may improve on these things and have centralised/dedicated/anti-cheat-guaranteed servers. Then again, it never impacted their profit margins so idk.

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