Tesla company is just being wise in this aspect. The company is taking advantage of its influencing power not just for their advantage but for everyone. For me, no crime has been involved here. They opened to the public their investment decisions and it's up to the people to when will they stop riding.
Tesla has not scammed anyone. If they openly told their investment decisions and other people are following it then what's fault in it. They never force anyone to copy the same investment strategy. I think this may be called manipulation but its not illegal as the big players have enough money and influence to move the market and that is what Tesla tends to do.