This stuck out to me too. There's nothing more frustrating for the actual leadership than someone with soft power who says they don't want to lead trying to come in and obstruct every decision.
As an armchair quarterback I feel like if he had kept his tinder dry he probably could have gotten some of what he wanted? He could have advocated to head up the casual spin-off app as a small team. Giving a founder who wants to step out of leadership a pet project is a very common way to handle this situation.
Instead it sounds like he got caught up picking fights on every decision and wasted his credibility. Talking to leadership is a skill and part of that skill is packaging things concisely and effectively. Even if the leadership used to be your confounders.