It achieves some sort of purity of concept. Plenty of people _gamble_ on the stock market but there has always been some sort of link to reality. With crypto, you can cut that tether and really treat it like gambling, rigged odds and all.
I'll go with completely agreeing with this statement, the way it's written. Let's be honest...There's nothing semantically or generally wrong with it to argue against.
As far as the "gambling" part... My objection would be that speculative vehicles aren't really on the "stock market" as much as they are the "derivatives market", if anything. Problem here is that the derivatives are, by definition, tied to the value of something else that could be called an investment. I'm not opposed to people trading. I made my money with market making algorithms and will make more as people keep trading. I'm just saying that classifying it as an "investment" poses quite a few issues for the SEC in terms of regulating it. Introducing it into an ETF that does nothing but hold crypto will be viewed by the public (that doesn't understand what crypto is) into presenting it as an investment. There are issues with that.