Yes but they were prevented from participating to various trades, which means that even if they moved somewhere else they would have lacked the know-how, this w

Yes but they were prevented from participating to various trades, which means that even if they moved somewhere else they would have lacked the know-how, this was not trivial in that era, given that formal education was not available to the vast majority of people, and given that the usual way to learn any trade was to be an apprentice at your parents' business. In addition moving to a new place was not trivial, you would have been questioned as to why did you move by the locals and you would have had no land to start with. All of this changed only with the industrial revolution, when moving from your ancestral place became "normal".