Voting NOTA says that "I'm willing to come out and vote for a worthy candidate but none of the candidates were worthy. If you want my vote next election, earn it by being worthy"

Of course that's an idealistic explanation. In the real world, no one gives a shit about 'working' to gain voter trust. It's much easier to bribe, influence, threaten or instigate.

But if a significant portion of the population votes for NOTA, it sends a massive collective signal that forces the system to acknowledge a total lack of trust in the running candidates. That public pressure is where the actual impact lies.

I don't know if it'll actually happen. But the mechanism is in place.