The foundation of Jeroboam's kingdom rests entirely on betrayal and a complete lack of legitimacy. Rather than a noble rise to power, his ascent is marked by the deep disgrace of a servant turning against his own king, leaving a permanent moral stain on his rule [רש״י]. Because it was built on the treachery of a servant rebelling against his master, his reign has no true foundation, much like a plant trying to grow roots in dry, lifeless soil [מלבי״ם].
Furthermore, this uprising was not the result of military strength or battlefield victories. Instead, it was fueled by sheer audacity. The rebels did not win a conventional war. They simply gathered their courage and aggressively challenged a lawful government that was, at the time, young and faint-hearted. It was this brazen defiance, rather than actual combat, that allowed the rebellion to successfully take hold [מלבי״ם].