There are still lots of people calling it a ponzi scheme lol 
They cant really understand that price is determined by supply-demand and there are no guarantees that it gonna rise like in ponzi schemes.
Exactly, there are many people saying bitcoin is fraud and a ponzi scheme. But if they allow themselves to know more about bitcoin they can learn that it has many benefits that could offer to anyone users. Yes it is really the demand and supply that price may decrease and increase.They cant really understand that price is determined by supply-demand and there are no guarantees that it gonna rise like in ponzi schemes.