a) it could be one of those bands that is meant to stop focus or zoom creep.
b) it could be a sponsorship
c) it could be a self-advertisement
d) it could be that the person is covering the brand logo. There are two reasons for this. First is that the camera looks more low-key without the bright white texts on it. Its not as noticeable, doesn't look as threatening, professional. Second, some people don't like to give "free advertising" to the camera brand. They cover the Canon or Nikon logo until the brand decides to sponsor them.
Originally posted by Digitalis Leica pays me $2K a year to wear my Leica cufflinks to fashion shows, photography masterclasses etc..
Can I become your apprentice? Or maybe you can adopt me?