John, I has many of the same thoughts you did when I was looking at Anchor.fm again as a possible microcast option last week. The relative ephemeral nature of it made me think "it's snapchat for audio". I suspect it may be easier for them not to have to host/stream old audio, though they do keep users' streams if you mark them to be saved. I also have a feeling it's much harder for users to build a native audience on such a platform unless they're bringing an audience with them. I was pained by how much hunting and searching it took to find an option to download and save my recordings to archive personally or to post on my own site.