Flow chart cycle. Top (start) is "popular platform gets worse", flowing to "users move to alternative centralized platform", flowing to "alternative platform becomes more popular". Here the flow splits: up to "newly popular platform is sold, takes VC, etc." which then flows up to "popular platform gets worse" again, or left to "alternative platform runs out of cash or volunteer energy" which then flows up to "users return to popular platform" and then back to "popular platform gets worse".