The futures strategy is no risk because it is a perfect hedge. Easily done through CBOE and CME as well. If anyone has a bunch of fiat not doing anything that they want to generate a yield on, this is a great strategy.
Now 20% with no risks and a perfect hedge? ELI5
Mr. Hayes's blog is, as I said, an excellent source of technical info.
The rope provided there might turn into a tool hang oneself, or into a lifeline for turning excess corn/fiat into income without selling.
The rule "no risk, no profit" remains solid IMHO.