Even if they do know, it's still an awful decision to take.
The less likely outcome is that everything will go fine forever after.
It will very likely either become a mess (awkward situations, loss of job even for third parties, etc.) or a disaster for everyone involved (like a sexual harassment lawsuit.)
Espcially if you are the boss.
And even more if the person wasn't working there to begin with!
> Square did not know of the relationship before a lawsuit was threatened; it came as a complete surprise to the company.
Is what makes it "perhaps the worst business decision a person could ever make"