Gaining then losing 50m users is a net negative in a world where "line goes up and to the right" (ie. momentum) is the most basic heuristic for assessing the viability of a platform (and especially so for social platforms where the users create the content).
The only way that negative effect is muted is if the 50m users is only a small fraction of the platform's reach. Say, under 2%.
The only way that negative effect is muted is if the 50m users is only a small fraction of the platform's reach. Say, under 2%.