Some languages use the comments to generate documentation. Something like

// function to add two numbers func Add(num1 int, num2 int)

I remember one time that I was in a traffic jam in the city that I was not familiar in. There where two lanes. I needed to go to the right so I went to the right lane. I waited and waited. The left lane already were driving. And then the car in front of me turned off his lights. The person left the car. Weird… I was between parked cars. I was there for a good 10 minutes.

Sure, but if there is too much electricity on the net, things will start to break. That electricity has to go somewhere. No one wants to buy electricity because everyone is trying to get rid of their surplus.

About the negative, I don’t know.

It’s probably not advertising that they are afraid that you will block but the trackers. They want to know what user is clicking where, how long you are on each page and what you ordered / not ordered.