By the next time Reddit messes up, and they will, the next batch of escapees will find a much more fleshed out set of alternatives, which will make leaving there and staying here easier. Rinse, wash and repeat.
I don’t think that even matters from a business point of view. Even if people aren’t leaving, the problem is that Reddit is not a place new people see as valuable after all the bad press. If they don’t grow, they fail.