>>88892521Because they are petty and anyone who dares to graduate or goes against the "you are worthless without us" brainwashing is an enemy to them. Selen wasn't the only smear campaign they've done, but they went to extra lengths against her because she was the second highest earner in NijiEN and her betrayal was unforgivable to them.
That and their CEO is the kind of asshole who says things like picrel unironically. That should tell all you need to know about the CEO and company.