Did they maybe try to market the show via the official fandom, which failed because the audiences there were disappointed, and are now trying to find other markets to pitch to?
The network cliques in Tolkien fandom are fascinating. There's lots of cross-pollination between, for example, the Tolkien Society, Prancing Pony Podcast, Signum University, Tolkien Guide, Digital Tolkien Project but you can go on certain subreddits and no-one seems to have heard of any of them :-)
For example, if a platform promotes content that keeps people on the platform then the content that people will see is more likely to be content promoting other creators *on the same platform* which perpetuates the social media silos.
Instagram will boost posts that promote other Instagrammers.
TikTok will boost posts that promote other TikTokers.
The open web, as well as podcasts, don't really have that property which is perhaps why they are less attractive to an Amazon.