caleb72's example: they are probably using stock photographs. If that is the case, there's a small chance of ending up with virtually identical covers.

fjtorres' example: the blogger is full of themselves. Neckties are a common symbol of the business world and hanging one like a noose is not exactly an innovative idea. And the audacity of accusing them of ripping off her cover when her title is a rip-off of another author's title.