That does not seem relevant? You are certainly not giving them a license to do whatever they want to do with your content just by hosting an RSS index of mp3 files on the web.
iTunes merely directs users to your podcast RSS feed and lets people download podcasts from your servers. As far as I can tell, they do not require you agree to any licensing terms, and as an RSS reader that simply lets users pull the podcast from your servers, they never "perform" the audio work or modify it in any way.
Google, on the other hand, hosts your podcast, and requires you to agree to this:
Podcast Creator grants to Google all rights necessary to use the Podcast Content in connection with Google Play, in search results and in Google Now in accordance with these Podcast Terms, including, without limitation, a worldwide, non-exclusive right and license to (a) make copies, transcode, download and store on Google’s servers or servers controlled by Google all such copies of the Podcast Content, including any files that are linked to or referenced by the RSS Feed that is provided by the Podcast Creator and as may be required to distribute the Podcast Content to users as described herein, (b) reproduce and distribute Podcast Content to Google Play users, including via download to a user’s device and as a part of a subscription; (c) encode, transcode, stream, make publicly available, publicly perform and distribute copies of the Podcast Content, including the right to provide continued access to any Podcast Content to any users who previously downloaded a copy of that Podcast Content even if the content has been removed from the RSS Feed, in order to facilitate that user’s permanent ability to access the Podcast Content as authorized by these Podcast Terms; (d) analyze, extract and process content and Metadata from the Podcast Content in order to distribute such content on Google Play and (e) use the Podcast Content for internal research, development and copyright measures such as content identification.
Perhaps you can clarify what's confusing to you? Generally speaking, if you want people to find your podcast, you list it in say, iTunes, or Google Play, so people can find it in their app of choice.
