This change updates the collateral requirements for three collateral assets: ZRX, BAT, and WBTC

As mentioned on the forums, WBTC collateral poses a threat to the financial health of the Compound protocol. Currently, WBTC risk is 8 times worse than it was 2 weeks ago and now accounts for 99% of the risk in the protocol across all assets. We are moving to lower the collateral factor for WBTC from 75% to 65%. This will reduce (but not remove) the aforementioned risk, and we will re-evaluate if the proposal passes before proposing to lower it further to 0.6%. If liquidity and volatility for WBTC improve, we will be sure to take that into account.

We are also changing the collateral factors for both ZRX and BAT, raising those slightly to improve capital efficiency for borrowers. We realize that bundling these changes might make the decision more complex for voters. However, these additional changes are small and were largely unopposed in the last proposal that merely failed to reach quorum amidst high gas prices.