That's a good point. That effectively makes Spotify a publisher rather than a platform. I'm getting sick of companies trying to straddle the line between the two.
Even if Spotify wasn't effectively publishing the Joe Rogan Experience, I do think Spotify's employees have grounds to complain. Spotify has not built themselves as an open platform for free thought - they have built themselves as a curated music streaming service. Employees who do not want to support an open platform for free thought could be justifiably upset.
I'm just sick of open platforms in general being expected by external forces to curate their content like a publisher.