Unless its your wife or girlfriend, why?
Also, most pro players use anime characters as profile picture which makes sense cause most are nerds, so people will copy that.
How about use profile pic of yourself standing with a nice view, or your own digital design?
imagine malding bcs of it, i play with no names no pictures and i dont give a fuck about other people, you should try it too. imagine caring if someone has a gf for a profile pic, you are in a wrong spectrum of hate my dude
Users dont put their original pics to ensure anonymity. The whole gaming ecosystem is built that way i.e. using alias. It's like the gaming identity is different from the real world identity
About the other part, I don't know why users put up photos of girls