Problem is that with the internet making information and personal opinions so widely available to anyone, there is no way to stop information flow. Pretty much anyone giving an opinion on any market is, by definition, artificially manipulating investors.
For example, any news show telling you "this stock is hot you should buy" or saying "this stock will fail and you'll lose money" (as CNBC did throughout the week) is manipulating the market, creating or affecting demand for certain stocks, because they are trying to change the perspective of investors. And this is on TV every single day.
A lot of the market rules were established in the 80's, before the internet, when you required an actual broker to buy stock. Now people just trade on the market through their phones. The laws are kind of outdated to be honest.