Whichever hacker group did this, their worst problem right now is hiding from all of the other ransomware hacker groups because the implicit contract -- you pay

Whichever hacker group did this, their worst problem right now is hiding from all of the other ransomware hacker groups because the implicit contract -- you pay us a ransom, you get your data back and we don't spread your data -- between hackers and victim companies is now broken. A victim company doesn't know which hackers will release their info anyway so whatever incentive they had to pay up and then try to fix their systems without worry of a breach is now gone. The hacking group who published data after getting paid is probably in mortal danger from other hackers now.