I think the risk surface with options can be significantly better-- e.g. if no margin is used for longs and if short calls are covered and short puts are cash secured, then the exposure is fixed and established upfront.

But I don't disagree that the there are much larger and more relevant gambling-in-the-guise-of-investing targets.

Also to be clear: I think there are legitimate investment uses of that product-- e.g. if you have a credible reason to believe the Bitcoin price will drop soon you could short a small amount with leverage while keeping the bulk of your holdings safe in cold storage. The extra fees and specific risks of the CFD may be offset by avoiding a need to touch cold coins. But I do also doubt that most users are using it that way.