Why does it matter to you if women who have sex with you show their faces or not in any activities you film? Or even if they are willing to let you film them having sex or not? Shouldn't either be up to the woman and that you should respect her reason?
Yes, some women don't mind showing their faces on the intertubes while nude or having sex, but there is an equal amount who, realizing some things are forever, do not want their identities revealed for whatever reason. It doesn't really matter the reason, nor do they owe anyone, including you, an explanation and they should not be coerced or forced to give up their privacy just so some guy can show off to the world the hot "chick" he banged just for bragging rights.
I have no secret to reveal because I respect (and agree) with my wife's decision not to show her face in any pics and vids I may have posted online with her permission, and I would feel the same if I was in a similar situation with anyone else.
But why does it seem like most of your questions are more like laments than actually questions? I'd stop worrying about what other guys are "getting away with" doing or wearing, that you can't and just be grateful you can convince some women to even film sex with you regardless of if they are willing to show their face or not. One would also note the irony of trying to figure out a way to convince someone else to compromise on their privacy considering in none of your pictures do you show your face.