It's not because it's happening on a computer. It's because the behavior is largely imitative or following a script.

The initial folks who figured out how to build a computer a minecraft were very creative.

Rube Goldberg machines I think do involve a fair amount of creativity. it's not because they are physical per-se, but because the physical environment tends to force individual and creative thinking to solve the problems unique to that environment. Physical environments tend to be less homogenized and predictable than digital ones.

Designing and building a replica of a Boeing 747 is less creative than a rube goldberg machine, but depending on how many decisions you made yourself while building it makes it more or less creative.