You can easily turn off cookies if you don't want us to use it to improve your user experience.
In your browser you can make settings that hinders Karma and others from registering cookies on your computer. Such settings does however mean that certain functions on most websites won't function.
On a computer
You can activate Do not Track in most web browsers.
On a phone
On iOS you can choose to enable Limit Ad Tracking. On Android you make these settings under Google settings and ads.