The Chernobyl tv show had a nice podcast that went with it as well. I think these kinds of extra features are especially nice when it is for a show based on real life. They get to point out things that may not have been 100% historically accurate due to budget/time, and also get to bring in experts to speak about things related to developing the show.

It is funny that these things often just get released on podcast platforms and aren't really integrated into the streaming service.

Especially since this show, and the shows mentioned in these parent comments are all produced by the platforms they got released on. So they also have a whole lot more control to actually integrate this extra content.

These streaming platforms often state they are competing to keep you on their platform consuming things, and it seems odd to me that they wouldn't want to try and capture people for longer with these kinds of extras. Especially since as the other user indicated, these would be much lower cost to produce and license compared to the original content. And for someone who really enjoyed what they watched it would be a pretty appealing extra to have.