Ahhh ...Yes
That is why I asked the question .... What contitutes "Fair" ?
Usually the protection of law to ensure a reasonable protection of rights to
both parties of a contract?
Thus one might expect that a unilateral decision of say a employer to be able to dictate the terms required of a bond MIGHT remove from an employee their fair terms of enployment as we consider them in this modern world.
I suppose the question has to do with retrospective changes to a contract of employment that advantage one party only!