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Plenty of people have tried. Replacing helicopters though? It looks like ornithopters don't scale well.

This guy in Japan posts his various experiments in ornithopteria. https://youtu.be/dHIF_2OsA_8

I remember going through a fascination with rubber band powered paper/balsa ones in childhood, they were very light and fragile. People tried to scale it at the time helicopters were first practical https://ornithopter.org/history.rubber.shtml

Probably not, in the new movie they where very dragonfly like too and looked quite realistic, but man the engineering a materials science to make that practical, not sure:

https://www.youtube.com/watch?v=qYPuhItRqVk

The wings on the thopters described in the novel by Frank Herbert were more bird-like than insect-like.

I don't know which type, if either, will be more practical to build as materials technology improves.