I think it's honorable to stand up for what you believe in in this way. But in this case I believe the cause he stood up against was a bit misguided.
Pretending this is a case of "spotify has an open platform that people can come speak on" is disingenuous, Spotify went out of their way and spent a ton of money to get the content he disapproves of on their platform.
(Comment aimed at a number of comments in this thread, including but not limited to the one I replied to)