The technology isn't really important, but its what makes this possible. Without it, no one would do the alternative of employing dozens of people to look at faces and search them in record books of people they want to ban.

I'm also critical of the legal argument - too often in HN someone will about stuff that isn't illegal. My question is: so what? This is a forum for discussions, not a tribunal. We are not judging, we can argue that something is shitty, or that laws should be changed.