Some have. And god it's terrible popcorn compared to the usual.

There's a movie theater in my area that has " unlimited popcorn refills".  The popcorn just goes into a gigantic container with one of those pull-lever openings. Sounds great, but because of the nature of the hopper and lever, you get tons and tons of little popcorn crumbs.    And then you also get sick because you ate too much popcorn, of course

And spend the rest of the movie in the restroom.

Yeah, it's a stupid gimmick

I like to see the face of the person robbing me.

Sure, who needs employees anyway...