I think you need to review the actual allegations being made. Many have found that when they try to check in and select seats as a group there are no adjacent seats available, but as soon as they agree to pay the adjacent seats fee suddenly the adjacent seats appear as if by magic. And the authorities have become confident that it isn't a coincidence because they have whistleblower evidence from staff and former staff involved in these systems.
Fraudulent and corrupt activity - essentially what we have come to expect from airlines. Clearly we need to reinstitute public flogging for airline executives and captains until they learn to behave in an honourable manner.