For example are you worried that a real human at your home security company will be invading your privacy? When they do are you worried that real human will take personal action against you? Or are you worried about automated systems building knowledge about your life based on home security data? Or are you worried about your home security data used in aggregate? Maybe you are worried about attackers getting access?
Internal infosec and privacy controls/policies are required to protect you from some of these. Some of these threats may be more likely from Google, but I'd say some of them are more likely from other home security providers (keep in mind that a lot of home security products are actually intended to have another human monitoring your home).