Workmate sold me his barely used Razer Ornata Chroma Keyboard.

Turns out in order to change any settings - like the color of the keys - you need to create a logon with them. The offline driver software "Razer Synapse" will not allow you to run without logging into their cloud.

I see now that the same applies for their Mice and likely everything else.

So, well done Razer. You've created basic PC hardware like Keyboards and Mice that require online activation to fully use them.