The answer is NEVER.
Why?
Because where there is good thing, there will be always bad thing. This is like two sides of the coin, cannot be separated. We can stop the scams because we cannot rule everyone, we cannot know who they are. And we also cannot know what is behind the scam. Scammers will always exist with their new and new ways of scamming, phishing, and also other deceiving ways to get money from their victims.