The year is 2035. You’ve just had the 3rd gen Neuralink reinstalled after the recall for sudden violent muscle spasms. It’s using your brain to mine Neuracoin™, but luckily that causes only minor cognitive dysfunction and almost no traffic accidents. Every half an hour you watch five unskippable ads (that cover both your entire field of vision as well as all your thought processes) for things to buy with Neuracoin™, because you haven’t mined enough to pay for the ad-free version.