Wait, Naoto uncovered it? She barely touches the network in the first place.

Though really, the people who are going to need that line of defense the most are the ones with the least network experience, so it's good that it has a low threshold.

[That's not why he locked it, though. He locked it because Naoto uncovering a means to catch someone prodding into your head severely narrows the suspect list as to why she uncovered it.]