Are you associated with Amazon? Because you're using two of their trademarks (Echo + Goodreads)
You can not trademark echo for different areas. And podcast is different.
This way of reasoning makes me speachless.
P.s. goodreads might be a case though.
Amazon has very generic trademarks on the word echo. Podcasts are a recorded format meant for playback that provides commentary on different categories. Amazon definitely holds trademarks on these types of areas. That said, I'm not a lawyer so I can't speak to how much issue the overlap would cause but regardless Amazon has billions of dollars and could walk all over anyone they want so I'm pretty sure if this got bigger and they took issue with the use of the name Echo they could cause a lot of hell.
In fact amazon can't have (generic 'echo' word trademark) and does not have it in any sane part of world. All sane states do not allow generic trademark on common word.
My speechless was (and still is) about how much brainwashed must we be to consider it fine, normal and to actually defend such practice. Yuck.
By the way, Apple Computer (now just Apple) was sued by Apple Corps and had to pay $80k, and that was in England, not in the US.