My experience is that people cannot copy original ideas for two reasons:

1. People generally fear originality until it receives sufficient social validation, but by then your business is established.

2. People generally cannot copy anything original after a certain point of complexity without motivation well into unnatural territory. For example nobody is going to quit their jobs to replicate your unproven idea because the effort is too high for something completely unused.

A rare exception to those two points is Minecraft. They replicated the idea of a sci-fi voxel game from scratch, changed the scenery, and kept in beta for years.