
Daily Mail says it reported the figure from conjecture.
Suggestions that Rockstar San Diego’s newest project Red Dead Redemption cost $100 million to develop is not based on insider knowledge or available figures.

Red Dead Redemption hits 3.3 million Netflix downloads on mobile, underscoring how subscription access drives reach over paid sales.
More like people don't play these type of games on their phone normally and don't try them out. Not like the places where people do play these games haven't crushed those numbers easily.
How many people actually played more than an hour of the game or came close to finishing it on mobile is the real question. If people aren't playing the games to a point that is purposeful, then why try when a subscription that is behind a streaming service isn't a sign of success but just curiosity.

Rockstar says the free upgrade issue affecting Red Dead Redemption Xbox 360 owners requires more time to resolve, with another update expected within five days.
I’m not sure what the exact issue is. I had no trouble getting the free update—you basically get the new game for free if you have the 360 version in your digital library. Maybe the problem is related to owning or not owning the Undead DLC expansion.

A detailed comparison of Red Dead Redemption on Switch 2, PS4, and PS5 shows stronger settings, better performance, and a major uplift for Nintendo’s new hardware.
Thats the Daily Mail for you.....
I thought gamers would have had enough common sense to know that it wasnt true without some article.
Can't remember where, but a developer from the studio said they needed to sell 5 million copies to break even. So you could do the math around that, but obviously none of us know the exact amount of profit a developer makes per sale.
R*SD has been working on RDR since early 2006, and its been in development alongside their other major franchise (Midnight Club) all the while. They employ about 150 people, as I recall, and the "industry standard" is $100K per person, per year (that's not salary -- that's all inclusive.. building rent, taxes, employee perks, outsourced work, etc)
That tells me they've spent about $60M on BOTH RDR and Midnight Club over the past four years, so I'd be willing to bet RDR didn't cost them $100M, or even much more than about $40-45M.
San Diego is an expensive place (even though huge numbers of game studios are in expensive locales), so pushing $50M might be in line, but $100M? No way. If so, their voice and motion actors really made out like bandits. Pun intended.