There was a contingent of what might be called libertarians who supported Bernie but then went hard for Trump and shifted rightward. It doesn't make much sense to me except that they're both nominally anti-establishment (in different ways of course).
You'll also note that I didn't actually call Rogan right wing, but it does seem that many/most of his listeners tilt right.
The point I was making is that it's highly unlikely that any leftist activist organization/company would support Rogan by platforming him, regardless of his actual beliefs (to me, it seems that he's just playing to an audience).