The only sin that's anyone's business is that the CEO was having an intimate relationship with a subordinate, and the only people that matters to is their coworkers, the board and the shareholders.
1. The coworkers, because these kinds of relationships can actually be very demoralizing. Even the perception of favoritism, whether real or not, has a terrible effect on everyone else.
2. The board because it is their fiduciary duty to protect the company's reputation and eliminate to whatever extent possible any liability that can come from such a relationship (superiors having intimate relationships with subordinates opens up a number of issues surrounding sexual coercion and the risks involved if the relationship turns sour).
3. The shareholders, because reputational harm and lawsuits can negatively impact their investment.
Nowhere in there is your tender sensibilities a consideration, beyond the very limited context that you might be a customer or advertiser who might get turned off. Even if that's true, being self-righteous and vicariously inferring your superior morality largely erases that, and as a Catholic, I'm sure it's at this juncture that you should ponder your Savior's own words at Matthew 7:5 before you delight in building yourself up on an Internet forum at the expense of fellow human beings that made a sad and not terribly uncommon error in judgment.
For myself, I actually feel very sorry for them. Beyond the damage to their reputations and careers, they are human beings just like me, capable of great joy and then great humiliation and shame, and for them, this awful coupling, even if completely their own responsibility, all happened while the rest of the world decided amongst all the real and tangible problems, to mock them. I viscerally hate it when anyone is publicly humiliated, even if they are entirely responsible for the humiliation.