Bernie Madoff duped his way into tens of billions of dollars. His ponzi scheme worked pretty well at scale. Until it didn't.
Never underestimate what the two most powerful emotions, fear and greed, can lead even the most intelligent and sophisticated individuals to invest in.
At it relates to any specific company, assuming that there's no funny business solely on the basis that significant amounts have been invested is the product of flawed reasoning. Investors in the U.S. are defrauded to the tune of tens of dollars every year. Annual fraud related to penny stocks alone amounts to a billion-plus dollars[1].
[1] https://en.wikipedia.org/wiki/Securities_fraud#Pervasiveness...