Borrowing against one's shares shouldn't be illegal. Companies lining up recourse financing for their employees should.
How were the terms of the loans chosen? Who knew who was and wasn't participating? How was it ensured this wouldn't factor into personnel decisions? How were/are the people setting the strike prices of options segregated from the people setting the terms of the loans? There is too much already loaded onto the employer-employee relationship, we don't need to add lender-borrower to the damn mix.
(Side note: the $300 stipend for financial advice is laughable. You couldn't even get a lawyer to review a fraction of such an instrument for that amount, and yes, I'd put recourse loans against private shares in the risky as hell bucket which should absolutely be legally reviewed.)