What caused people to stop using the free service that is MySpace? What caused people stop using the free service that is Digg? Being free isn't particularly novel. Facebook isn't providing this service out of some sense of altruism. It is incredibly profitable.

What about the tariffs would cause people to stop using it? Because they - along with many other of the administrations postulations and policies - are incredibly unpopular and a complete 180 of US foreign trade policy. Because tech is a money printing machine for the US and tech oligarchs who have largely bent the knee to Trump.