Really? You know of examples of passenger planes taking off with only one engine turning? Or of any twin engine airplane doing this deliberately (other than a test flight or desperate emergency, like the volcano is gonna blow any moment).
i was lalking about the situation of planes taking off in barely flyable/safe situations that would not be allowed by modern faa regulations, which it think is larger point that was being argued, not debating about the single engine or propeller case
a. people in less developed countries
b. people in said countries with less money to spend than others
this has happened before (south america in the 70s, etc), which is why the aviation industry has the regulatory system it has today