What is 401k 10% fee?

Excuse me, could you clarify what you mean by "401k 10% fee"? As far as I understand, 401k plans are retirement savings accounts that employees can contribute to, and these plans often have administrative fees or expense ratios associated with them. However, I'm not aware of a universal "10% fee" that applies to all 401k plans. Could you be referring to a specific plan or scenario where a 10% fee is charged? If so, could you provide more context or details about the situation?