I knew a trader in Texas in the 00’s. Worked with to oil traders. Total hearsay but heard stories from this person of traders in TX calling friends they grew up with who worked in Cushing Ok (large pipeline exchange or w/e the technical term is) to adjust the flows a bit over lunch and then change it back.
It happens, Enron traders were turning off power plants in California that Enron owned to drive up electricity prices (and cause rolling blackouts). They only got caught after the implosion, i'm sure things like that happen all over the place in many industries.
So, I believe it