@amitsurti shared with me how Google may load Google AdSense ads on really slow connections. He shared a video with me of how Google will replace the AdSense ad with a message that reads:
Google detected you're on a slow connection and optimized this page to use 80% less data.
This is the Google Web Light initiative to optimize web pages on slow mobile connections.
Here is a picture of the replaced AdSense unit with the warning:
Pretty interesting, don't you think?
Forum discussion at Twitter.