Can I be filmed, without consent, while I am inside a place of business talking to friends, and someone on the sidewalk outside begins filming.

Two gentleman came through our town and began filming all the patrons inside businesses. I don't mean grocery stores. There were restaurants, and really any business on the street where they saw people inside. Their goal was to show they have a legal right to film anywhere from a public place. They then load that video up on youtube and make money from that video. Their site actually has a place where you can pay them to make more content like this, and so they do. I get you can film people in public areas, like a mall or parking lot, but if they have to physically make an effort to film inside a place of busness, would people inside have a reasonable expectation of privacy?