imo it's more crazy that people thought of tracking users by using a font in the first place. The level of human ingenuity that has gone into spying on people is staggering.
Follow the money. It is always about the money. I was at a corporate security conference where one of the speakers stated that organized crime groups hire the top mathematicians and computer scientists from the top universities every year. They provide them with laboratories that you wish your company could afford.
Did the speaker have a source for that claim beyond their own word?