“…These propositions contribute to the handful of studies on the intertemporal dynamics of alliances (Lavie & Rosenkopf, ), alliance terminations (Asgari, Tandon, Singh, & Mitchell, ; Reuer & Zollo, ), and vertical integration decisions concerning “make‐or‐buy” choices (Jacobides, Knudsen, & Augier, ; Leiblein, Reuer, & Dalsace, ). Moreover, our theoretical insights resonate with Hannah and Eisenhardt () because these scholars examine cooperation and competition of entrepreneurial firms in nascent ecosystems (see also Moeen & Agarwal, ), whereas we look at the problem of incumbents facing an ecosystem in which a downstream entrant emerges as a platform leader.…”