You went and clicked the "you have won advert", didn't you?
You just couldn't resist it, could you?
You knew it was a bad idea - it was right next to the text explaining why it was a bad idea to click such things - but you went ahead and clicked it anyway ...
And now I could be installing viruses, spyware, adware or keylogger software on your computer (or phone).
I could be changing the settings on your internet browser so I know every page you go to, or changing your home page and search engines to ones I want you to use so I can steal all your personal information.
Please don't do this again!
Go back and read the basic rules again, and this time pay attention, or read about Malware and the kind of things criminals can do when you are careless like this.