My research tells me that IB liquidates automatically positions in case you go under a certain margin requirements. Transactfutures offers automatic liquidation in case you hit a certain % loss or $ loss. I am interested in other brokers, platforms that offers max daily loss protection, I prefer this to be on the broker's side instead of having this on my software (more difficult to cheat)
Autostops could wipe you off the face of the earth if you're hung on one of the superspikes which tends to occur when global events happen.