I have an EightSleep from before their enshittification into a subscription model. It is a good piece of hardware, but I can no longer recommend it because the software is so crappy. I checked the logs on my router and found that it was streaming tons of data to servers even when I wasn't using it. I have no idea why it would stream that much data since the trivial sensors it has shouldn't be producing that much data even if it had multi Hz sampling. I can't tell if this is incompetence or some sort of malfeasance where they are secretly recording audio data via motion sensors and streaming that.