To add to previous answers (about the quality of dev builds etc.) – the last thing Rockstar would want when they do the big official gameplay reveals, is everyone going “meh, we saw all this in the leak 2 years ago. What else you got?”
In a long, drawn out development process, you don’t want everything revealed a year or more in advance of the release, and have the hype being a year old when the fans finally get their hands on the game.
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