The EOS network recently experienced an exploit where a small number of accounts purchased a large amount of REX resources for about 300 EOS and used that to extract 30,000 EOS in manufactured winnings from the EOSPlay gambling app. EOSgo has an article that explains this. In short, by buying a very large amount of EOS CPU resources cheaply, the exploiters were able to essentially shut down the EOS network to nearly all transactions but their own and exploit the process that EOSPlay used to generate random numbers, essentially ensuring that their bets would be winners. Because the EOS network became clogged and the cost of CPU resources grew very large, the EOSPlay app was not able to pause its contract to stem its losses.
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