
Useless.
You already have a free "decryptor" in the form of your backup tapes.
Right?
Even ransomware operators make mistakes, and in the case of ransomware gang the Key Group, a cryptographic error allowed a team of security researchers to develop and release a decryption tool to restore scrambled files. The decryptor only works on a specific version of the ransomware built around August 3, according to threat …
As the decryptor only works for a specific version, it may be that the operators already realised and fixed their mistake in later versions. So you wouldn't be telling them anything they didn't know already.
To the author: The company is called EclecticIQ, not ElectricIQ. I can just imagine the wailing of their marketing people having gotten their blog on the front page of TheRegister only to find their name misspelt.