The earn deposits has outpaced the collateral side of Anchor (which fluctuates based on the price of bAssets). The hypergrowth of earn deposits is primarily the result of MIM degen box and as many people stated above is unsustainable.
Perhaps a way to keep the system in check is to put a max ratio of earn deposits / collateral value. This is a model just proposed as a potential solution: [Proposal] Institute a deposit limit when there is a max of 80% earn deposit to collateral ratio