I was recently offered a job by NSO, didn't take it due to their terrible reputation. I won't be surprised if some countries start denying entry to NSO employees. Even Facebook suspended accounts of NSO employees after NSO hacked Whatsapp - https://www.vice.com/en_us/article/7x5nnz/nso-employees-take... .
On the other hand, their product is just a tool which can be used for good (stopping terrorists) or evil (spying on human rights activists). Just like a kitchen knife can be used for good (cooking a meal) or evil (stabbing people). So I find it hard to find the moral justification for the actions you suggest. The problem is not the tool or the tool's manufacturer, it's how it gets used.
On the other hand, their product is just a tool which can be used for good (stopping terrorists) or evil (spying on human rights activists). Just like a kitchen knife can be used for good (cooking a meal) or evil (stabbing people). So I find it hard to find the moral justification for the actions you suggest. The problem is not the tool or the tool's manufacturer, it's how it gets used.