So as is often your problem you are equivocating. Even if every agreement included the "implied covenant of good faith" that does not necessitate your ideas about "fairness" ie. "no mine hopping".
So until you come up with an argument to support that - your point is dead.
I made that argument about 10 places in this very thread. But just in case you somehow missed them all, I'll repeat some of them for you:
"A pool hopper does benefit at the expense of other miners."
"That is nothing like a mining pool where many miners believe their interests are aligned."
"If you left the pool because you want to shift a disproportionate share of the work to the other miners, only to re-enter it when you claim a disproportionate share of the profit, that's bad faith. That's abusing the system to get a share greater than your fair share at the expense of your fellow miners."
"Pool hoppers see it as a competition to get the most from the cake. Other miners believe that it's a cooperative. That's the problem. If everyone understands it's a competition, that's fine. But otherwise, you expect that the guys on the same team as you are playing for the team, not themselves."
"Entering a profit-making cooperative with others when times are good, taking a disproportionate share of the profit earned by the work of others, only to desert the cooperative as soon as hard work is necessary to make more profit, with the intent of re-joining the cooperative as soon as the hard work is done in time to get another disproportionate share of the profit is an inherently unethical practice."