Add indication if the podcast is already listened.
What is the problem you are facing?
There is no visual indication of whether you have already listened to an episode of a podcast or not. It's a bit disorienting I think. There would be many possibilities for this. Either by graying the links or the card of the episodes that have already been played. Or by adding a label under the episode that would indicate that it has already been listened to.
What are the possible drawbacks or issues with the requested changes?
It would be necessary to record the reading information for each user. Difficulty in determining when a podcast is considered listened to. Eventually remember where the user stopped the playback, to be able to resume it later. (I think there is a mechanism like that for Peertube videos, I don't know if it helps)