My guess for Ethan's reveal is something Creator Clash related, outside of the obvious laziness and incompetence anyone can see. With all the creators leaving, and previous people involved feeling mislead or burned, there could be several people with dirt to share about Ian. There's been speculation about Ian being liable for civil damages for tanking the event; maybe Ethan has proof that it was knowing and deliberate, or that Ian violated contracts and is on the hook financially without realizing. It would be pretty stupid and humiliating to tank your "charity" event and put yourself in a position to be sued, especially with Anisa bragging about how they insulated themselves.
It could also be the proof that Ian knows nothing about Israel or Palestine, but if it is, Ethan is overestimating Ian's ability to feel shame. It's been obvious that he has no idea what he's talking about, and isn't actually smart enough to follow the typical leftist rhetoric.
I actually hope it's something more interesting than either of those, because I want something really crazy for the entertainment factor.