So the plaintiff’s are claiming Siri was recording them without consent, and that Apple were sharing those recordings with third parties including advertisers.

Apple claims they were sometimes wrongly keeping recordings for internal quality control/analytics but hasn’t admitted to sharing them, and have agreed to the $95m settlement.

The sharing with third parties is the most egregious part here, but it doesn’t seem to be addressed any further.

There are some Xiaomi Bluetooth temperature sensors available. I have a few of the LYWSD03MMC models. They are very cheap, have a LCD screen, and can also be flashed with custom firmware.

I have a few flashed with custom firmware and use them as general sensors around the home integrated with Home Assistant via ESPhome proxies.

I’m not sure how you could monitor them from both a phone and a Bluetooth proxy, but as they are so cheap and hackable they might be worth playing with.