Sometimes a whole project could be built with the team members having never even met before, but sometimes are recruited by the main founder due to reputation, so these team members do not need to move from there homes to handle the project, they just do everything remotely from wherever they are, I have seen quite a few successful projects like this, and sometimes it could also be regulations, the project could be registered in a country with friendly Cryptocurrency law if the main team members are in a country that's known for it's intolerance for Cryptocurrencies.