I will submit you're podcast link of choice (Apple, Google, Spotify, personal website, whatever you want) to over 2,000 directories for SEO backlinks and promotion. You're welcome to submit multiple gigs for multiple website links.
Any link is indexed by search engines through thousands of random directories to generate more backlinks and more visibility for all your domains and sub-domains. There are no guaranteed results as it reflects on your meta tags and how you're website or page is set up with keywords and things that search engines look for or are often searched for. Nobody can ever guarantee results, the only thing I can guarantee is that your link will receive a lot more exposure by being submitted to all of these directories that are all indexed by search engines including Google, Bing, Yahoo, etc. (I will send screenshots to prove all of your submissions as well).
I provide 20 screenshots of my submissions (I am unable to provide a word or excel document of all of the submissions due to time restraints and orders would take much longer to process).
Screenshot links are the submission links and not the actual links of your link being placed in the directories.