Economic decision
Visual effect artists made the economic decision to change from filming to using a lot of computers. They also made the economic decision of replacing real explosions with digital explosions. Then they started making more money because it was digitalized and they didn't need much money to do it. Because they have digitalized their movies they are now able to do more because they are now able to shrink people, make robots, make people seem like something else and make people have super powers.
Visual effect artists made the economic decision to change from filming to using a lot of computers. They also made the economic decision of replacing real explosions with digital explosions. Then they started making more money because it was digitalized and they didn't need much money to do it. Because they have digitalized their movies they are now able to do more because they are now able to shrink people, make robots, make people seem like something else and make people have super powers.