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I think "dangerous" is pretty clear.  It's when doing as recommended can cause significant damage to property or health.

For example, recommending to a hobbyist to make a direct line-connected capacitor charge pump power supply for powering his breadboard would qualify.

Dangerous does not mean you won't get the required result, unless not getting that result poses a danger itself.  A bad circuit to start a water cooling pump of a nuclear reactor might possibly be labeled dangerous, but even that is pushing the intent a bit.