Stock pumping is illegal as it purposefully uses misinformation to manipulate the price of a stock. This harms the investors of the stock, the company, and any other stakeholder of the stock. Stock regulators monitor the markets for pumpers and impose penalties for the act.
Stock regulators monitor the markets for stock bashers and impose penalties for the act.
You've come up with one example: the Craig case, from 2015. Can you find any others? More than 95 percent of such actions are brought against pump and dumpers. The number is probably close to 99 percent.