There's also the part where it simply wasn't possible on many older SoCs to record calls[1]. Back then, there were apps that recorded calls using undocumented A

There's also the part where it simply wasn't possible on many older SoCs to record calls[1]. Back then, there were apps that recorded calls using undocumented APIs available only on Qualcomm SoCs, and no one else had any call recording. Combined with legal problems around call recording, I guess nobody cared. [1] My first android phone would get physically disconnected from microphone input by the modem during a call