Also, ad loading causes the page to shift around all the time while you're reading it. Many big sites have become unusable because of this. I should point out

Also, ad loading causes the page to shift around all the time while you're reading it. Many big sites have become unusable because of this. I should point out WeTransfer here for doing the opposite. Their background ads are full screen, often video, and don't distract from what you're trying to do (upload a file). Nicely done.