Binance cut collateral ratios for six tokens from 30% to 10%, while Coinbase International plans to remove 29 assets from its eligible-collateral list. Token prices do not need to fall for leverage to tighten. A lower risk weight alone can shrink borrowing capacity and margin headroom. https://cryptoslate.com/exchanges-lower-token-risk-values-leaving-leveraged-traders-with-less-breathing-room/