Having "underlying risk" to something just means you invested in it before. So for you it's not a gambling as long as you... have gambled before in the other direction?
Buy bunch of call options? Gambling. Buy a bunch of put options for stock I already hold, somehow honorable investing.
No - it means you are exposed to - electricity / gas / oil prices. Or Wheat maybe?
It's all gambling. You can dress it to as having a social purpose, but that's not why most people do it - they want the numbers to go up. The stock market is exactly the same - middle class gambling.