With RC the left stick up/down behavior goes all the way back to that being an actual throttle on the gas-powered fixed-wing model plane. It was natural for "up" to be more power and "down" less. In a real plane the "throttle" control works roughly the same, but is not a stick like on an RC controller.
The pitch stick movement on the right stick mimics the pitch control of a the stick in a stick controlled real airplane (very rare these days, vintage, everything has a yoke). Push forward, aircraft pitches forward/down.
Since a drone doesn't have wings, the flight dynamics are different, more like a helicopter in terms of how attitude affects movement. Video games were usually flying planes, so the control dynamics matched
Bitlife unblocked that flight behavior.