If Evil Coder sends an email to Noble Coder describing the vendetta-motivated reversions, then sure, something might happen. When would it ever be so obvious, however? If this is done quietly, and Noble happens to work in different parts of the codebase every cycle, she might not even realize the reversions have occurred for a few cycles. Even then, many people would assume there was some fair-minded rationale the first few times. After it is clear that something is going on, Noble can make a stink, but she might also just want to cut her losses and make a lateral move.