@Lynell0 Like you, I also go on a guest's past reviews and the way they communicate. You certainly can't make any judgement about a person based on their photo, unless it's something wildly inappropriate, like someone posed with a gun, or scantily clad or giving the finger to the camera. But thanks for taking my point that not being open about sharing a real photo of oneself is incompàtible with wanting to stay in a private room in someone's home and share the kitchen and other common spaces with the host.
Luckily, in 3 years of hosting, I've never had a guest who I had to ask to provide a photo- they all already had them on their profile. Maybe because most of my guests tend to have had accounts for quite awhile, since the time when Airbnb was more about community and sharing, rather than just some anonymous online situation, and usually book private rooms in a home, rather than an entire place.