What is the significance of such an act?
There are apparently theories that it has something to do with gaming the keywords:
Despite initially seeming like Apples move to take down cryptocurrency-related podcasts is a sign of their animosity towards cryptocurrency, some Twitter users believe that the podcast was actually removed as a result of a keyword stuffing, which is when an app, podcast, or website, that uses long titles filled with keywords in order to rank higher on search results
We won't know for sure until we hear from Apple itself though, if that ever happens. It's also possible that they broke some other iTunes agreement, considering it's a private platform at the end of the day. I'd put down the censorship pitchfork, for now.