The recently announced Amazon Echo 4th Gen (the sphere) and the new Amazon Echo Show 10 (the mushroom) both have integral Zigbee hubs in them. Zigbee always seemed like an outlier technology, with Z-wave being the increasingly popular player. I have mostly Insteon dual-band mesh since it's so bloody reliable and I use Z-wave for my door lock interface.
I originally thought that Zigbee used 802.11x WiFi transmission and IP, but I saw a post from Jay about seven months ago that it does not. I've seen a few posts about Zigbee and Indigo and I believe there may be an Indigo Plug-in. Does that Plug-in require a physical interface? To the best of my knowledge, Indigo supports only Z-Wave, Insteon, and legacy X10 protocols. From Jay's post, it appears that Zigbee does not use IP, so how does Indigo (even with the Zigbee Plug-in) physically interface Zigbee devices.
With Google and Amazon seeming to have some fascination for the Zigbee devices, I can only wonder why.