We definitely don’t have any hard boundaries baked into this tech preventing big tech from (ab)using our data this way. But are there specific companies you think are doing this? I think with Meta products, it’s been rather obvious for a long time. But I’ve had a Nest doorbell camera and thermostats for years, and first iRobot and now Roborock vacuums, and they don’t really seem so suspect.
Amazon literally just put out a superbowl ad of them using their (your?) front door cam feeds to find people.
They are all dipping into our data for their ends, Meta is just particularly sloppy/honest about it
You should assume that Google is collecting every scrap of data they can from nest products and that your data will (or could) be handed over to police and the state with or without warrants and with zero notice to you. There were concerns raised with irobot devices selling the floorplans of your home (https://gizmodo.com/roombas-next-big-step-is-selling-maps-of...) and now its owned by China (Picea) so who knows what they're doing. Roborock is also a Chinese company who appears to have been under investigation in Korea for data leaks (https://koreajoongangdaily.joins.com/news/2025-03-05/busines...).
At this point I'd consider anything not locally hosted (and certainly anything owned by Google, Amazon, or facebook) to be highly suspect.