Oops, sorry I was confusing!
By the “main thread” I just meant the same thread you referenced. The one I started about the overhaul of this binding.
The bulbs I got were Phillips WiZ and matched with what is listed on the WiZ website. (WiZ | Consumer | Products). Several others have either mentioned Home Depot or Cosco, so they’re from the same group.
I honestly don’t know if the bulbs need to be connected to the WiZ servers to work. I’ve never tried to cut off their ability to call home. I would assume that since they’re sold in regions where it applies that everything is GDPR compliant. In the same way, if it says “WiZ” on it and uses the app, I’d assume it works with this binding. But I don’t know.
For what it’s worth, the WiZ app is quite nice. It’s my favorite app of all of the various smart home device apps I’ve used. I really like the “rhythms” feature that you can set to gradually adjust color temperatures throughout the day. And there are some functions that you definitely do need the app for - like the initial WiFi setup and everything related to energy monitoring. I never figured out how to get the energy numbers and I didn’t even try the WiFi setup. I was also never 100% satisfied with adjusting the colors from openHAB. I had a really hard time figuring out how to translate between the openHAB color channels and the ones the bulb uses. The colors do work from openHAB, but it doesn’t quite match what you’d get with the WiZ app.