Basically because there no limits to what you can do with Ethereum you can write a contract that leeches the resources of the network and the only way to solve this would be to limit what people can build on ethereum ( meaning its no longer able to support every program imaginable) or one could create a central entity that can remove parasitic contracts but that just ruins the whole decentral concept This means in short that the basis for Ethereum is flawed in a fundamentally insolvable way.
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