I just started playing in early Feb and I've had a few instances of hackers, but not a huge amount. One or two blowing up hacks, and one or two other questionable ones. Then the one that was spawning cougars on everyone around after they vacuumed a bunch of people up. Was easily fixed with an instance swap though, so it wasn't a huge deal, I don't think. Annoying, sure, but not a deal breaker for me as of yet.