I firmly believe a successful logo should be just as impactful in black & white as it is in full color.
Try as you might, you cannot always control usage and presentation of your logo. At some point it will get printed on a B&W inkjet. Perhaps it ends up in a newspaper? Or someone turns it into an on-air watermark. Doesn’t matter, so long as you’re able to maintain clarity and brand recognition in B&W.
As such, this collection of logos have been deliberately showcased in grayscale as to not detract from the overarching idea and composition — the very backbones of logo design.