GTA makes billions yes, but it's people working on those games, they want their work to be seen the best way possible not because someone got into their systems and decided to leak it. Specially with games like this with years of development.
I don't think she's right; she says leaks are awful for excited fans but I'm an excited fan and it's not awful for me. She's speaking in sweeping generalities, speaking for people who aren't her. This video didn't give me any expectations for GTA VI that weren't already obvious; e.g. it will be a 3rd person game where I can commit crimes.
do you genuinely think that coders for gta VI are going to care that their work got seen before it was finished? how vain do you think these people are?