If someone takes the rss feed link from a substack and adds it to the podcastindex, does that circumvent the paywall on all apps other than the substack app? Or is the rss feed for a paywalled podcast kept “offline” where it can only be accessed through the substack app

While I wouldn’t recommend using substack to a new user, for current users I would think asking for rss feed customization features prior to migrating off the platform would be an easy thing to do. It would be useful to have one of those premade letters (like people make for asking senators to vote yes or no on something) that has useful links and explains the features that any current substack user could copy and paste with some customization into a ticket. This approach could be used for any legacy platform that could ostensibly add podcasting 2.0 functionality