Frontier expeditions weren’t exactly a rare occurrence for Freelancers. Considering even schools like the Sword Saint Academy and Sorcerer’s College made points to bring their students to such places for academic or training purposes, access to the locales were doable so long as one had a Hunter to act as their guide for such a trip.
Granted, there were restrictions on such things, as with anything. One wouldn’t see a group of students touring the places within a Frontier seen as the most dangerous to be even with a guide keeping an eye on them.
And when something especially dangerous such as the new target for any in the Frontier? That was cause to prohibit any activity not undertaken by the Hunters of assisting Freelancers from occurring. Best to leave these things to the professionals willing to take the risk involved with investigating and managing these threats.