[lucasban]

How is blockchain technology mutually exclusive from being able to take legal action against e.g. fraud?

Sure there are implementations that can be used that way, but the core idea of a blockchain could be used to do the opposite as well, for example by making transaction information public and verifiable.

[kspacewalk2]

At some point in its lifecycle, it's no longer enough to hear about what a technology "could be used" for, because the time has come to judge it on its actual real world uses.