Once you receive confirmation of permanent resident status you can do whatever you want, move to another province, change job etc. You have a right to live wherever you want regardless of province of nomination. There are no written rules or laws about how long you have to stay, however there are “not written” rules. Whole point of PNP is that you contribute to your province and they help you get PR. If you move out your province next day after getting PR, is it going to look nice? Maybe in couple years on your citizenship interview they’ll ask you this: “how come you promised to live in contribute to that province but moved next day?” Misrepresentation? Again, it’s all “not written, “rules of etiquette” I would say. Basically they can go after you, question is are you willing to take this risk, and if this risk is worth it?