Well yeah Rockstar is mostly at fault ofc. But even the musician is a shithead IMO, like most youngish people have played a GTA game in their lives. It's one of the most mainstream game series in existence and GTA 5 especially set new records for Rockstar in terms of sales and profitability. So as far as younger musicians go they should know full well what Rockstar refusing a new contract means for customers of their games.
But I honestly doubt it's so much the musicians themselves so much as their keepers trying to buy another mansion and thus seeing this video game company as a income venue by not letting a fucking DECADE OLD game keep shit with which it was originally sold.
I get that they made a contract in the past with certain terms and all that shit but at the end of the day the product itself got worse over time and from my point of view that's a travesty. I always view problems like these from the view of the customers and it's almost always in their detriment. And I find it hard to care about either parties when neither are going to even pretend to care about me or my preferences ( like not losing content from a DECADE OLD GAME HOLYSHIT).