It's in their best interest to put up a photo that portrays them honestly. If they haven't read any of those books, it'll be immediately obvious, and they've wasted their own time. If they never do shots in a bar, but put up a photo of the one time they did that, it still tells me something about what they think is special and how they see themselves.

It's not perfect. It's not meant to be. It's a heuristic that still leaves plenty of people to talk to for the second pass, and that lets me spend enough brain power to present myself well while we decide if we should meet in person.