I can't see any foolproof way to make an Object (Player) be bound by regulations they can't just delete. BUT I guess if all agreements between parties are done through the same two Objects (which are held by noone but eachother), then it can be constructed so removing yourself from being bound also means that all other agreements are broken. And so, assuming all agreements are balanced or you have other agreements that you don't want broken, then you're tied.
But this neccesitates Players be held by only these Objects (or other objects which recursing up the holding tree end up with these Objects as the root), otherwise the decision to do an action needs agreement from the other non-bound holder…