I hope all my privacy extensions + facebook container prevented this, if they were using embedded elements on the site.

the U.S. Video Privacy Protection Act [...] prohibits dissemination of “information which identifies a person as having requested or obtained specific video materials or services from a video tape service provider.” [...] By selling tickets to prerecorded movies, which have traditionally been shown via open-reel technology, and delivering those movies to consumers in movie theaters, AMC is a video tape service provider

That seems rather a stretch.

What kind of data are people giving to AMC?

Ironically I couldn't read the article because it blocks adblockers. What's AMC?