I'm not familiar with turbos, but to me it sounds like a CFD? How does a short position on a turbo prevent you from losing more than what you "put in"[0]? If you're shorting underlying X at price Y with a turbo, and price moves to Y+10, you're going to lose 10 times the leverage factor. You could have stop orders, but those are not guaranteed to fill at a price that would cap your loss to a desired amount.
the broker is required by regulation to "just close and not ask for more"
Some American brokers will also forcibly close your position instead of issuing a margin call. Do you mean that under those national regulations, the broker is required to eat the losses?
[0]: in quotes, since with a short position it's not really the case that you put something in.