>It quickly leads to creators sanitising feedback to prefer only positive feedback

I dont see this as a big issue. It seems to be a place for podcast community members to gather and discuss instead of making yet another discord. If you dont have positive feedback for a podcast why comment at all to begin with? The podcast medium is entirely built to taste and fits well with being a bubble (despite bubbles usually being a negative thing).

The hidden issue would be power to cover up a scandal, so I would hope that for serious issues users can report a podcast and site admins can handle it appropriately.