I think a lot of cryptocurrency is used for the wrong purpose.
Suppose to purchase illegal drugs on DeppWeb or DarkWeb.
And also used for smuggling money from corruption in several countries.
Some of the countries banned crypto by the government because they don't have a control in crypto. Some government official in some countries still wanted to have a share of profit in the people who are using and earning in crypto and they cannot easily do that because they don't have a control so they banned it in their own country.