The app has supported custom episode artwork since early versions. However, not everyone follows the existing standards, so the app has been enhanced to pull custom artwork from these 'exotic' feeds.
Also, I discovered that custom episode artwork was not showing up when previewing the podcast episode list from search results. This is now fixed.
For the past 8 years, the app has allowed users to customize the ad format. The default format used is the ad banner which is the least intrusive format. Users could replace this format with an interstitial ad displayed from time to time while browsing the app.
I just started getting complaints and bad ratings due to how Google's interstitial ads work right now. Even after explaining that they could restore the default ad format, they remained angry and the reviews remained.
Therefore, I am now removing this option so that everyone has the same banner ad format in the app. This will simplify the code and testing of the application...