/r/AmazonEcho is a community centered around the Amazon Echo, or as we like to call her - Alexa. Alexa is designed around your voice. She's always on—just ask for information, music, news, weather, and more. She's also an expertly-tuned speaker that can fill any room with immersive sound.
I have an Echo Show 8 and it took me awhile to figure this out on my own. On your Echo Show, go to "Settings" and scroll down and press "Alexa Privacy". You may have to do a verification process to verify your Amazon account and that it's actually you. After that look at the "Overview" section, mine was to the left of the screen. Press "Manage skill permissions and Ad preferences". After that, scroll all the way down to the bottom and turn off "Receive interest-based ads from third-party skills and content providers on Alexa". Amazon tried hard to hide this setting......