If it's being used instead of some other wire transfer in order to dodge government rules on capital controls etc, then yes it's used to evade the legal system

If it's being used instead of some other wire transfer in order to dodge government rules on capital controls etc, then yes it's used to evade the legal system and thus also fraud. The fees are not incredibly low nor is the service particularly user friendly or reliable compared to something like Western Union. Bitcoin et al is not providing a useful alternative to existing, legal services. They do of course provide an alternative for other services.