They only offered cloud control and APIs were private — they actively rebuffed any attempt by the community around Home Assistant to better support their product.
No Matter, nor ZigBee or Zwave, so with the shut down they are another IOT device you essentially need to rip out and throw away, this is painful since they were approximately $350 USD each.
At least HomeKit saves you a bit from that - my Best Buy switches keep working via HomeKit long after Best Buy gave me gift cards for them and shut down their servers.
But it's all really a crock, so much smart home stuff is just not needed.
We told him we're almost certainly ripping it all out, because my mother does not need a smart light switch that costs $300 and will eventually go out of business. She needs a switch she can hit with one hand to turn on the kitchen lights.
If it keeps working when the Internet is down, at least somewhat, maybe it can be considered. Otherwise, nah, ain't nobody got time for that.