It is worrysome that one person can influence so much the markets, but let me dig deeper:
What worries me, is that more and more, communities are looking for such informal leaders for advise, which is not necessarily a bad thing, the bad part comes, when the analytical thinking process that every person should have and execute, doesnt happen. This has been partially the reason why so many fake news have been widespread, because more often people are not willing to discern information or to critically analyze it.

In almost every industry we have such informal leaders that are shaping the minds and guiding decisions of consumers.