They think about Bitcoin as a ponzi or pyramid scheme. Some of them think it as a great way to earn money and become rich. Nearly none of them think about technology or Blokchain.
Yeah, it is a great way to earn money but most of the people who are new to bitcoin never really care about the technology, all they know is how to gain profit from bitcoin. This is proven that why many people are being scam to join ponzi scheme were its blatant in the internet. I really cant blame them if they think bitcoin is a ponzi or pyramid scheme because of their first hand experience while not really realizing what bitcoin is.