Typically mobile game ads will show the most exciting features of the game and the gameplay, but not every ad, only the decent ones. What is annoying is that some others don't show the real gameplay in the game, which are the annoying fake mobile game ads.
I guess you've already seen many examples of fake mobile game ads when surfing the Internet. Today not only mobile games but also Youtube or some social platforms like Facebook or Twitter, are usually plagued with advertisements for mobile games. The ads appear as long as you're connected to Wi-Fi or mobile data.
Let's take a look at some examples.