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Battlefield, CoD, AC, all the sports titles, GTA. More or less everything build by one of the big three uses their own in-house engine.

Err at least some Battlefield games, fifa 17 and 18 use frostbite engine. I don't think one can call it custom.

> what is the most used engine today if not UE nor Unity?

My answer was aimed at that part. But yeah, maybe we should define what "custom" is.