Extreme Difficulty Given by Nature

In the Korean comments

One comment reads, in translation, “The BTS members are so kind to accept everything as unfair interference.” Another singles out the running wordplay between “nature issue” and “nature interference,” showing that the joke is the rule’s increasingly generous application, not merely the outdoor mishaps.

What the words mean

억까 (eokka, unfairly attacking or obstructing someone) is casual internet slang derived from the idea of criticizing or targeting someone without reasonable grounds. Here, 자연 억까 (jayeon eokka, nature’s unfair interference) playfully treats puddles, trees and even height as if nature itself were sabotaging the players; the register is exaggerated and joking.