Bethesda games, generally open world, use an engine (https://en.wikipedia.org/wiki/Gamebryo for older games and https://en.wikipedia.org/wiki/Creation_Engine for most recent), they certainly don't go reimplementing it.
> Or military games like Call of Duty have their own.
No, they used the id engine and improved it over time.
> Also most bigger publishers breed their own engines to save the fees for licencing a third party engine.
Like ? for instance Bioware (as part of EA) uses Unreal engine. You mentioned FIFA games: they also use engines shared across a huge swath of games: https://en.wikipedia.org/wiki/Ignite_(game_engine) and https://en.wikipedia.org/wiki/Frostbite_(game_engine)
The only big release I know not using an engine shared across multiple game series is the recent Witcher games engine.
Bethesda games, generally open world, use an engine (https://en.wikipedia.org/wiki/Gamebryo for older games and https://en.wikipedia.org/wiki/Creation_Engine for most recent), they certainly don't go reimplementing it.
> Or military games like Call of Duty have their own.
No, they used the id engine and improved it over time.
> Also most bigger publishers breed their own engines to save the fees for licencing a third party engine.
Like ? for instance Bioware (as part of EA) uses Unreal engine. You mentioned FIFA games: they also use engines shared across a huge swath of games: https://en.wikipedia.org/wiki/Ignite_(game_engine) and https://en.wikipedia.org/wiki/Frostbite_(game_engine)
The only big release I know not using an engine shared across multiple game series is the recent Witcher games engine.