Bitcoin is a Ponzi scheme, investment scam, and only used for illegal purposes only.
Back then it is what most people think about Bitcoin specially those who doesn't really know anything about cryptocurrency, most of the time the negative comments comes from those who doesn't really know a thing about it.
Bitcoin haters is still pushing that narrative of calling Bitcoin Ponzi scheme because of their involvement in pump and dump coins and the wrong rumors that was falsely going round by Bitcoin haters but the majority of those they had been involved in criticizing Bitcoin investors has been confirmed to be those that has never been involved nor investment their Penny in Bitcoin yet they believe that Bitcoin is a Ponzi scheme.