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Potential 51% attack from Amazon

I see that more relaxed. In theory darksend works with only 1 active masternode. Therefore we only need to consider amazon a possible threat if 100% of the nodes are hosted with them.
Check this post on bitcointalk: https://bitcointalk.org/index.php?topic=421615.msg6699243#msg6699243
A VPS provider which you can pay in DRK, use them. Support the coins commercial value and knock down the number of Amazon nodes. If some authority happens to ask Amazon for the data from the masternodes, being the kind of corporation that they are they would HAVE to comply. FlokiNET claim to respect anonymity and privacy and it's one of their main selling points.