We are on the lookout for potentially threatening events such as hardforks. In the past, the chain split that led to the formation of Bitcoin Cash had impactful implications for the lending markets. Policies differ between exchanges but lenders on Poloniex who loaned out their funds during the time of the hardfork only received bitcoin in return and did not get bitcoin cash. To protect our users we temporarily suspended all lending on Poloniex.
We will stay on the lookout for future upcoming events such as hardforks and policy changes of exchanges.