A lot of smart devices such as Philips Hue can work completely offline, but if you want to control them remotely you need to agree to their cloud terms and cond

A lot of smart devices such as Philips Hue can work completely offline, but if you want to control them remotely you need to agree to their cloud terms and conditions, which most likely includes selling your data. So from a user perspective they get added benefits, but the hidden cost is their privacy.