What happened to section marks in podcasts?

What happened to section marks in podcasts? When I started listening to podcasts over 4 years ago, I noticed that a number of them included "section marks" (aka chapter marks) in the audio timeline which allowed you to jump from section to section in a single click. The podcast producer would use these sections to break up the podcast into logical chunks.
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Guest [Entry]

"It looks like this is only available if the podcast is encoded as AAC, which would make life difficult for many potential listeners.

(The relatively few) Podcasters bothering to produce enhanced podcasts therefore end up producing a plain mp3 version anyway, so when subscribing, make sure you get the right feed"