The massive environmental harm bitcoin causes is not voluntary. We don't get to choose whether bitcoin miners should pump massive amounts of CO2 into our atmosphere, they just do it.

The massive societal and economic harm of ransomware is not voluntary. This is entirely powered by bitcoin and other cryptocurrencies, and we do not get to choose whether giant criminal gangs should be given a way to extort businesses all over the world, businesses that provide crucial services to people.

Nothing about this is voluntary. The harm is forced on everybody.