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https://www.rockstargames.com/gta-v/thankyou

They have updated their policies a bit. You may not be in the game credits but you'll show up here.

FWIW the social club team which handled a lot of the online components was small around the time GTA5 released. They built the APIs to handle user generated content, telemetry, accounts, etc. But, there were other team members that made it so the game would call said APIs.

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I remember hearing in an old podcast (Dad & Sons), one of the guys there worked at Rockstar in QA in 2012 and he's still listed in the credits for Red Dead Redemption 2 (2018), so the policies are unclear to say the least.
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