ADSENSE IN A STREAMING WEBSITE

Guys I've found this website they got millions in traffic.
They get traffic from google then they redirect it into a website that runs on a script that let them show adsense ads in the page that the movie in.
It's like they are giving to every one an UID so without this UID you gonna see the article webpage only so that how I think they've been able to stay doing this for over a year now according to similarWeb

Any opinions
Where can I get the script hhhh

How can similar web know what they are actually doing, these estimating websites are not that accurate imo.