Purpose: This paper studies early stages of actor mobilization for institutional change within Swedish esports. Design/methodology/approach: The authors employ interpretative phenomenological analysis. Findings: The authors’ findings explain how actors become motivated to act in critical reflections linked to conflicting legitimacy judgments and emotionally charged personal struggles. Moreover, the findings show how, as actors get activated in collective action, they identify efficacy lines around valid domains and experience emotionally charged collective endeavors. Furthermore, the findings explain how particularities in early experiences project legitimacy aspirations that orient collective action toward validity ends and particular values and ideals shaping actors' grassroots movements. Originality/value: This study adds to legitimacy and institutional change theory through individual actors' perspectives, providing key insights into how they are motivated, activated, and oriented. This study is the first to investigate grassroots activists' personal stories in esports.