Today’s story is about Philips Hue by Signify. They will soon start forcing accounts on all users and upload user data to their cloud. For now, Signify says you’ll still be able to control your Hue lights locally as you’re currently used to, but we don’t know if this may change in the future. The privacy policy allows them to store the data and share it with partners.
The app rating in Google is currently 4.5 stars. I did my part in leaving a review, and got a nice "As our features grow..." pasta reply.
Edit: I've also downgraded the app to version 4.38 and disabled auto updates (both for the app and the firmware), and asked my housemate to do the same. That should keep things working for now.