How? If a civ is falling behind, they can choose to become a vassal. They can then demand techs from their master, but the master has every right to refuse. The master can demand techs from the vassal, but that would probably be pointless, if the master already has most of the techs that the vassal has.
As Frank said, human nature basically prevent any meaningful exploit coming from this. The only way it could be done is through constantly taking vassals and then releasing them. Now, whilst it is possible to absent-mindedly trade away techs, it's not very easy to keep flipping vassals to get the best tech advantage. You would have to be actively trying to break the rules.
As Frank said, human nature basically prevent any meaningful exploit coming from this. The only way it could be done is through constantly taking vassals and then releasing them. Now, whilst it is possible to absent-mindedly trade away techs, it's not very easy to keep flipping vassals to get the best tech advantage. You would have to be actively trying to break the rules.
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