I remember reading one of Forbes' annual listings of the world's billionaires in which they tried to include a photo of everyone in the top couple hundred. Astonishingly a few had no photos -- Forbes said that they couldn't find a photo. According to Wikipedia, "Forbes employs a team of more than 50 reporters from a variety of countries to track the activity of the world's wealthiest individuals." So you can absolutely be among the richest people on Earth and not have a publicly available photo.
On the current Forbes list the following have no photos: #23, #36, #61, #122, #153, #167, #191, #198, #215, #233, #244, #272 (two people at this rank), #290 (also two), #343, #355, #365, #379 (two again), #394, #413, #452 (two again), #504 (four people), etc.
That means that 5% of the richest people in the world (24 of the richest 500) are so anonymous that there isn't a photo that even a dedicated team of reporters can find.
Current list: https://www.forbes.com/billionaires/
> That means that 5% of the richest people in the world (24 of the richest 500) are so anonymous that there isn't a photo that even a dedicated team of reporters can find.
Either they can't find it or they were asked not to put it up? They have lawyers after all and might prefer to be anonymous.