I don’t get your original point then. You suggested google lawyers looked at the problem and suggested to use ADT, when in fact they both still sell smoke detectors and it’s their home security system that they’re dropping… likely because it was expensive and never a winner. If it made real money (which their fire alarms do) I don’t think they’d be dropping it, and they never explicitly used ADT while they were selling the product; it’s an alternative now that the hardware you originally bought for hundreds or few thousands literally no longer works.

If you look at their Nest Secure offering, it was always half baked. They didn’t have enough accessories to make a compelling line up. Rather than legal liability, it seems far more likely to be another half-in-half-out product that Google is infamous for rolling out and then killing a few years later.