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Back in the 2010s certain central banks lowered rates below zero so borrowers were effectively paid interest to take on the loans. It is a situation that should never happen but it did.
Sadly only the richest of the rich were able to take advantage of the sweet deal.

I knew such a great deal wouldn't be for everyone.

that was a thing while rates where low, some banks penalized you for holding cash in your account. It was about -0,2-0,3 percent per year.