“Trusted by” Scam

On one hand the meaning of "trusted by" logos are greatly exaggerated, but on the other hand companies owning these logos like to bite hard if they are pictured as endorsing something that they haven't even heard about. At least one of the companies I used to work had a department hunting, and sometimes litigating such false endorsements. These logos can be usually used for such marketing stuff only with explicit (written) permission of the logo owner.