>>724026465
porting isn't an automatic process, takes time and effort. Even lending the job to 3rd parties requires oversight, and no guarantee they'll do it right (Risk of Rain 2 is a prime example of that).
They already tried releasing on other platforms and were faced with issues. With Sony they have a familiar & proven pipeline, no reason to deviate. Clearly they don't want to massively expand their studio, and despite occasional money problems they managed to survive and arguably thrive (last 2 games were passion projects) for decades. It's that simple really.