I don't understand what is the question. Whoever hide the camera maker and/or model does it for some reason, depending on what it is it may or may not make sense. I know one guy who is a pro and have been partially supported by a certain camera maker who claims that after receiving the sponsorship he covered other logos both as an appreciation of the fact he was supported and to express that having his name associated to a camera costs money. Does it make sense? No idea, nobody ever gave me any camera for free, but maybe it does... Some wildlife photographers claim that the white logo makes the camera much more visible to animals. Does it make sense? No idea again, but after all some animals are used to avoid predators who are just a few inches in size, so it is not completely impossible that white logos, or even more the shining bits such as the golden "FX" found on Nikon Full Frame cameras, might actually be clearly visible if they catch the light in the proper way and so after hearing the story I taped some of my cameras. Many people seem to do the same to avoid attracting attention. This really I don't buy, but if they feel more relaxed that way, then probably this helps their photography, so why not after all? I only tape what is used with animals.
GLF