For most slot machines, this is a non-issue. The RNGs used isn't necessarily a secret (most companies use known good algorithms), and there is plenty to seed t

For most slot machines, this is a non-issue. The RNGs used isn't necessarily a secret (most companies use known good algorithms), and there is plenty to seed them, including player/coin input, network traffic, and plain old run-the-RNG-really-fast-continually-so-it's-tough-to-time. However, this particular hack was with old Novomatic games, a small company at the time that didn't do a very good job here. This is a long solved problem with most other vendors. Bugs do happen, and they're generally covered under the "Malfunctions void all pays and plays" on every machine, and software updates that casinos may or may-not update the floor. Sometimes the news reports on some underflow error, but anybody with internal knowledge realizes the credit meter just went to 2^24-1, or something like that. These are really non-stories internally. Source: Slot machine developer in previous life.