I cannot speak on behalf of others, but I can definitely explain my circumstances. I do not have a public picture of myself, at least not an authorized one from me, because I am still deciding on a hairstyle I can connect and identify with. I chose to distribute my full name in order to participate in VanLUG as a board member and to become a Qubes OS “paid” support provider, among other public functions:
I utilize my experience to maintain a compartmentalized and finely scoped public identity while broadly promoting the Linux ecosystem as a whole.