I have been using this recently (since Sephirothtold me about it) for my larger channel and my new one. In the past I would have to use distributors to get content onto Spotify but now you can upload your videos directly there. They dont need to be converted to audio and theres certainly no harm uploading there to hopefully earn some more revenue from your content and repurpose it. Have a look if havent already -
Tools to manage and grow your podcast - Spotify for Creators
Get to know Spotify for Creators (formerly Spotify for Podcasters), the free audio and video podcasting platform of Spotify.
creators.spotify.com
I think it is always worth repurposing content like this especially when the only real effort is adding the title, desc and click upload and publish. I like to think that it is in the platforms best interest to promote said content too with it being on their servers.