Yes I truly believe that all scripts fail in long term use. But the red train that would kill this script has passed few days ago in ethercrash, so chances to find that again are low. It took 3 million rolls for ethercrash seed to find that streak so as you understand it you run it for just few days and double your 2 Eth investment, you could be safe. Script does some bets and skips some rolls so it can avoid the long red train.