What happened is that David Hedqvist, the previous admin of this forum, bought a license for that image. The license is only good for him (as explained here). If other people want to use this image, they have to buy their own license.
Also, the Shutterstock license mentions that their images can’t be used in logos.
c. RESTRICTIONS ON USE OF VISUAL CONTENT
YOU MAY NOT:
vii. Use any Visual Content (in whole or in part) as a trademark, service mark, logo, or other indication of origin, or as part thereof.