None of these are AAA or AA games though, which is my point. Plenty of talented devs who worked on AAA titles have gone on to work on really smaller titles, including some really stellar titles like Firewatch. If the counter argument to consolidation limiting developer agency is the option for developers to leave these big publsihers/studios and create a new studios, then you have to compare like with like.
The fewer independent environments for AA and AAA games that exist, the fewer options there are for developers to create such games. We know from the FTC case how much money Sony spends on their AAA first party titles. Horizon Forbidden West has a budget of $212m and The Last of Us Part 2 had a bunched of $220m, both are which are ridiculous - like closing on half a billion dollars for two games.
I mean,
@see colon provided perhaps the most famous example of ex-Atari developers forming Activision. Infinity Ward is small potatoes compared to that.
While he didn't work on a AAA title
immediately prior to forming Shiny Entertainment, David Perry did work for a AAA developer (Virgin Games) immediately prior to forming Shiny Entertainment and before that he'd worked on a AAA title at Probe Software called "The Terminator".
Firaxis is probably cheating a bit since they had Sid Meier on board. But they immediately started to make AAA PC games, many of which were award winning.
ArenaNet was formed by Ex-Blizzard employees and immediately released the AAA title Guild Wars. No Western publisher would help fund their game so they went to S. Korea and got funded by NCsoft.
BTW - I'm leaving out Studios who's first AAA release was a flop and led to the demise of the studio. For example, Flagship Studios was formed by former Blizzard executives and developers which made the AAA title Hellgate: London which received massive hype and I regretfully dropped over 100 USD on for the collector's edition which included the bonus of forever access to any future content released for it. Unfortunately, it was so buggy and reception so poor that live services for it didn't last more than a year or two.
Back to successful studios by former AAA developers.
Moon Studios, formed by former Blizzard developers, made a little known game called Ori and the Blind Forest.
Irrational Games was formed by Ken Levine (formerly worked on Thief: The Dark Project for Looking Glass Studios) along with a couple other former Looking Glass developers and made another little known title, System Shock 2. I'd say he ended up
significantly larger than the studio he left behind. Irrational Games ended up being a larger and more influential studio than Looking Glass.
Ion Storm was founded by John Romero, Warren Spector and a few others. While John Romero helmed titles failed, they were still AAA projects. OTOH - Warren Spector helmed the creation of one of the most influential video games of their time, Deus Ex: Invisible War. Ion Storm might be a joke, but they had money, influence and budgets that dwarfed the vast majority of developers of that era.
Oh, and there was also Peter Molyneaux who left Bullfrog Productions to form Lionhead Studios.
Obsidian Entertainment was formed by former Interplay and Black Isle Studios employee Brian Urquhart and some other co-workers.
I mean, the list goes on and on and on and on throughout the 80's, 90's, 00's, and 10's.
Regards,
SB