Amazon Sidewalk is actually amazing. I can't wait to see what startups do with it.

Amazon just opened up a free, nationwide, low-power, wide-area network called Sidewalk. It's optimized for IoT devices. It’s great at securely and privately sending small quantities of data impressively long distances. It reaches 90% of the US population. 

Some devices can connect as far away as several miles. 

Here's a piece I wrote for Computerworld tell you everything you need to know about Amazon Sidewalk