Spotify does not have a trademark on rss podcast delivery. RSS feeds have historically been the primary delivery method for podcasts and it long predates Spotify and the JRE. Many of the most popular or historically significant primarily used RSS: Serial, This American Life, Stuff You Should Know—the list goes on and on. Some podcasts are distributed via video, but even many of those also have a corresponding rss feed for the audio version.
I didn't claim it had a trademark, but if you literally skipped entirely over the comment I was responding to: he quoted the Spotify docs for their podcast APIs as an argument why podcasts are RSS/MP3
And his second link literally confirmed how entirely wrong his own claim was, within literally the first paragraph. Which you seem to have skipped over too....
So where does that leave us? With now two very confused commentors that seem to be unable to read, hence my previous quip about reading comprehension
In case your genius mind wasn't able to comprehend this amazing concept: the technical implementation of most podcasts in 2000s does not define the concept of a podcast.
Yes, once upon a time, that was the most common way podcasts were distributed. It however wasn't the definition of the word "podcast".
Did you get that, or was that once again too complicated for you?