https://capitalgram.com/posts/how-to-money-launder-bitcoin/
For example, the REVil author is known
https://threatpost.com/revil-ransomware-core-member/175863/
It is all about geopolitics, privateering and for Russia and China to see incompetent Western companies to suffer.
edit: not a crypto fan personally.
Bitcoin makes it easier.
(nothing personal, plenty of people use it but it is so illogical that it wild be unethical not to protest)