Aileen Getty is a philanthropist who inherited money and has nothing to do with the oil company. Her father and the rest of her family sold their stake when she was young. This is just a convenient conspiracy for oil companies to spread because people just fucking slurp it up without the minimum due diligence.
While that’s often the punishment, this particular event was a repeat of a previous event that resulted in a two year prison sentence. At least that one particular judge is throwing the book at climate protesters for minor acts.