With leveraged products (like rolling turbos [1]), that risk is usually on the offering institution? I dabbled in those a few times when pretty sure (or full) of myself. There are no margin calls in turbos, you add leverage to your liking (x 2, x 5, x 10, ..) and you pay a hefty interest on your leverage (say 7%). Your exposure is exactly the price you bought for.
Unfortunately I was long Kraft (the food co), completely unleveraged, and got taken out at a 15% loss thanks to a flash crash-induced stop loss. It taught me a lesson that only losing real money teaches.
[1] https://en.wikipedia.org/wiki/Turbo_(finance)