Ponzi teams can use any tools to run their pyramid business. Bitcoin is only one of their tools and tools are changed by trend in society. Nevertheless, it does not mean that tools are used by them are scam from their intrinsic specifications.

You can not say gold is a scam asset if you find out a ponzi scheme with gold is presented in their advertisement. The same goes for bitcoin and whatsoever.

Please be differentiated between intrinsic scam specification and is abused/ used as a scam tool.