The article states that’s what the privacy policy sais samsung can sample every 500ms and LG every 10ms. It doesn’t really mean they are, but it’s definitely possible. A very basic way of detecting content is to take a 1000 pixels evenly spaced out over the screen and store the color values. That gives you something you can match against a database. You don’t need to process a 4K screenshot for this.
Question for all 3, what are Hungarians doing to get rid of orban?