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Spam is only good, if it is widely distributed over the network. So if there are enough fullnodes which are used for the spamming transactions, everything is fine. If only a few fullnodes are spammed, this could harm the network. Additionally there is the coordinator, which is a bottleneck right now. The devs are using spamming attacks, to research the tangle and to get more knowledge on its behavior under stress. This is currently happening. Nevertheless, the spammer needs to do PoW, so it is not as cheap to spam the network as you think. As you can see, in general it is possible to harm the network with spam.

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