However, it still remains that he claimed to have a great system that would produce oil from waste but he did not deliver on the promise.
That is not true, as I remember. At one point I did a deep dive into all of this. One of the judges in one of his cases stated on the record that he was producing oil from waste. Rossi was at the forefront of this technology and received an early patent for it. He had a thriving business at one time, until the regulators came down on him (and hard). One person in particular who doggedly pursued Rossi in those days was recently convicted of fraud in a large EU scandal. Goes to show the type of enemies Rossi had. He still has many it seems.
The oil from waste industry is now relatively large.