A few years ago, I found a plugin developed by Amazon that allowed me to offer a free (to the end user) audio version of all my posts. This worked well and only cost me a few pennies a month to run through their services. So it was a win for me and gave more people access to my posts.
Unfortunately, I have recently found out that Amazon has stopped this plugin and removed all traces of it. As a responsible site owner, I keep my site updated with WordPress and plugin patches as soon as possible.
This means, I have had to remove the plugin from my site and for the time being, I will be unable to offer an audio version of my blog. This also stops it from working on Amazon Echo devices.
I am looking into alternatives and if I find something equally useable, I will test it out and roll it out.