discoverability, if a friend talks to me about a podcast I could be interested in, i'd rather just have the name of the podcast than a full URL.
Here i can just use any podcast app that integrates with Apple podcast service and type the name of the podcast i want to listen to.
Your question is the same as: "Why do you care if $YOUR_SEARCH_ENGINE (google, kaggle, duckduckgo) hosts a list of websites?"