According to Prince, the group may be responsible for up to 80% of all spam that gets blocked.

CNN: Massive cyberattack hits Internet users

Matthew Prince, CEO of Internet security firm CloudFlare, estimates the group may be responsible for up to 80% of all spam that gets blocked.

CNN: Spain arrests suspect in massive cyberattack

If Royal walked away, and an alternative tie-up with Carnival deal was then blocked by regulators, the company would be back to square one, probably leaving shareholders nursing hefty losses.

BBC: Valentine test for Princess tie-up