As the recent fuzz about the mandatory use of an account in the Philips Hue app shows (I blogged about it in Dutch: https://blog.xot.nl/2023/09/17/straks-account-vereist-voor-philips-hue-app/index.html) the 5th Privacy Myth - We Always Need To Know Who You Are.
https://blog.xot.nl/2021/09/27/privacy-myth-5-we-always-need-to-know-who-you-are/index.html is unfortunately still alive and kicking.