I'm a bit miffed about my first electric toothbrush that my dentist prescribed me. It's called a Philips Sonicare DiamondClean and it cost me $180. When you're at the dentist, it's customary to pay at the time of services rendered....I already regret this. The problem is that this toothbrush requires the Philips Sonicare Android/Apple app. I gave it a whirl, but during the setup process I've noticed so many dark patterns. For starters, it requires that Bluetooth and Location be on all the time. Secondly, the app does _not_ allow screenshots to be made of it! It just disables that on Android for me. Third, the manufacturer does not state any of this on the package, and probably has no necessity to do so.
https://news.ycombinator.com/item?id=27136202
https://news.ycombinator.com/item?id=27136202