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There's big money in the reverse phone sector if you have the right connections. I don't understand why this is a bad idea...
It's bound to happen that the customer blames you for the result of their decisions later.
I don't like to tell clients they have bad ideas. I'm afraid doing so will have them looking at me like I didn't do everything I could to make it succeed and THAT is why it failed.
I would rather do everything I can, and have the IDEA be the problem, not me.