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Isn’t that a problem that’s already solved by one way mirrors? Light can still come in, you can see from the inside out but people on the outside can’t look inside.

Added bonus of seeing some hilarious faces because some people treat those as normal mirrors and don’t realize there are people on the other side.

It’s less about people seeing you - does it actually matter? It’s about seeing people see you. That can feel uncomfortable even it has no consequence that they saw you. By giving you a perception of the scene without people it can feel more comfortable than a blank wall or people walking past.

They don't work if hidden side is brighter than the public side. So not at night.

Frosted window film is much cheaper and easier.

If you want to get fancy, you can layer the frosted film over variably tinting film and it'll regulate the light coming in.

I wonder what's the light transmission of frosted film vs lenticular film.

Isn't this what frosted windows are for?