[jordanab]

Amazon and Apple are both members of the CHIP working group. As far as I know, CHIP uses Thread as one of it's protocols (the other being a BLE derivative). Sidewalk uses WiFi, which is not very efficient for low-powered devices (eg. sensors, switch etc.)

[leonsmith]

Fair points! Looks like they are all memebers of eachothers working groups, no wonder the standards are a mess... https://xkcd.com/927/

[jordanab]

Well to be honest, I really like the open-source approach that they have decided on for the development of the standard. You can follow the development of it's reference implementation on the Github repo of the project: https://github.com/project-chip/connectedhomeip