In the past couple of days, the market has seen a sharp drop followed by a sudden surge. It's easy to get liquidated if the contract is opened in the wrong direction. Trading contracts can come quickly and go just as fast; some newcomers think they are skilled after just one successful trade, not setting stop-losses and opening large positions. When the market fluctuates by a few points, it can wipe them out in one go. For most people, if you are seeking stability, it's still better to buy BTC spot.