No, I think it means that they were originally going to get paid, so they had that reason to do what they were doing. When they were no longer going to get paid they (logically) should have quit, since they had nothing to gain by staying, but they did not.
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NL888Thanks.But what you explained is what I guessed in the first place.Sorry, I misunderstood you. The sentence implies that they had the right to quit, but does not specifically say so. It does say they had no reason not to quit.