[D.Bolen]

OP, thank you very much for sharing this info. I'd previously heard nothing about it and I'd prefer to opt out (to start at least).

Re Locating the Opt-Out optionfor any others who've had trouble finding it:

You have to be "in" (using) the Alexa app to make this change. I first tried to find Alexa's "Sidewalk" by getting into my device's "settings," which include a list of apps you've downloaded, and then click on the Alexa app (I thought by doing this I was following the instructions to "go to the Alexa app") and found several options to make changes, but nothing showing up re "Sidewalk."

I finally found it when I did not go into the Device settings, but went to the App icons on the device, clicked on the Alexa app, THEN went into ITS "settings" and found the Sidewalk app. So when the previous posts saying "go to the Alexa app," it means to actually open the Alexa app. As another poster mentioned, you might also get into the app via Siri.