Negative interest = the new national bank of Seeley.
You can now gain more interest by stuffing your mattress with your earnings than you can by leaving in the hands of “trusted” financial professionals (using the term “professionals interchangeably with “thieves” of course).
Never trust someone else with your financial well being, and especially those “financial professional” who tell you that it is foolish to not trust them.
I believe the original banks did the same, payment for keeping the money safe from theft.