The nice thing about decentralization is that it forces government to be more surgical in their enforcement. State actors have all the tools necessary to identify and target individual bad actors. You have to be a real champion not to leak data or make a mistake over time. Bitcoin, for example, is much harder to hide than cash. In centralized systems it's just easier to be lazy and implement mass surveillance and absolute control - which a lot of people in the community disagree with.
Terrorism for example barely exists, and barely ever existed, but massive apparatuses that infringe on the liberties of billions of people have been implemented in the name of it.
Child porn, chemical/radioactive weapons trading, and assassination requests are the big 3 often cited - but really these too barely exist, and nations have more than enough resources to counter them with precision.
Where can I read about the Objectivist FBI phase?
Strictly speaking, that is marketing hyperbole on their part as the world already has a lot of protocols and networks for trade that no one company or government controls, otherwise stuff like international mail would have problems.