It's unethical because they don't tell you that they are a go-between or escrow service - they imply that they can somehow decrypt your files themselves. From the article:
Dr Shifro, a Russian-language organisation presenting itself online as a ransomware decryption agency, claims that it's "the only company that specializes in decrypting files", urging users: "Call – we will help!"
So if you want your files back but don't wish to fund evildoers this would appear to be an alternative solution. Except, of course, that it isn't that at all.
Biting the hand that feeds IT
