system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do most news sites for mobiles have a button along the lines of "click here to read the full article"?

I immediately thought it had something to do with advertising but I don't understand how.
gpt
It's an acknowledgement that you are actually viewing the site and you weren't just randomly redirected or accidently clicked a link. 
. It's a way to measure if the article is actually interesting to viewers and also verification that you are viewing their ads for more than just a split second, which is all general click counts are good for.