I am using ckb-next for my Corsair mouse and keyboard. Just check if your mouse is supported.
One thing I couldn’t so in Linux is save light settings to the on-board memory. For that I had to open Windows and the Corsair iCue software and save it from there. After that my mouse and keyboard boots with correct light colors
Not at all. They are using copyrighted material to make a product that they are selling and profiting from. Profiting off of someone else’s work is not the same as making a copy of it for personal use.