I agree with your point. To elaborate my position, once one builds an opt-in surveillance network, it only requires a shift in public policy to remove the opt-in nature. You would have to have strong confidence in the safeguards against such a thing -- mainly the court system siding with privacy, which is not a sure thing historically speaking.

I would cooperate with the police to help solve an actual crime, but I certainly would not opt in to this. I would even go one step further and say that I likely wouldn't buy this product at all.

I would prefer home automation systems that have basically no cloud infrastructure. It is unfortunate that, if such a thing even exists, it is poorly marketed.