This comparative study investigates how platform governance conceptualized as "technogarchy"—amplifies epistemic crisis, characterized by public mistrust and information fragmentation. Through a mixed-methods design (survey: n = 2,393; focus groups: n = 80), we analyze the divergent contexts of Nigeria and Canada. Structural equation modelling reveals that platform governance significantly increases fragmentation and erodes institutional trust, with effects markedly stronger in Nigeria (β = 0.547 vs. 0.423). Digital literacy moderates this relationship in both countries. Qualitative findings expose contextual resilience profiles: Nigerians exhibit network-dependent, fragile resilience amid deep state distrust, while Canadians show institutional-reliant resilience burdened by digital fatigue. The study concludes that technogarchy acts not as a uniform force but as a contextual amplifier, exacerbating pre-existing historical and political fractures. It empirically links algorithmic governance to epistemic injustice, demonstrating that the crisis of shared reality is disproportionately borne by post-colonial contexts. The findings demand context-sensitive epistemic repair, prioritizing transparent platform oversight, equitable digital literacy, and democratic governance models that re-embed platforms within locally legitimate public values.