That's only true within a limited set of constraints, for example, the tech industry. The film industry also uses the same term "FU money" and it means the same

That's only true within a limited set of constraints, for example, the tech industry. The film industry also uses the same term "FU money" and it means the same thing: the ability to choose your situation. In that industry, any successful actor or director will forever remember the pivotal project that put them over that line.