Well, sometimes. A lot of people just marry someone they went to school with, or worked with, or who was in their friend group or local community. It was simply a matter of deciding to pull the trigger.

Obviously there's still the narrow margin of "living in the same place at the same time", but that margin is much wider than "be in this exact game server at this exact time of day on this exact day".

And some are big “had to happen” (right college choice, wrong WoW faction choice, etc) and others are “the specific had to happen but would have eventually” - if you’re both playing horde on the same campus you’d eventually meet in game or IRL, for example.