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Feel about it as you will, this kind of thing will happen more and more. Imagine all the shit that's going to be on your node as the years pass. It's not hard to think of some pretty alarming scenarios.
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Yeah, those rickrollin' MF's be everywhere.
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Alien launch codes
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Is it that much different from, say, an email server? Sure, the intend of a Bitcoin node is somewhat different from an email server. One is routing financial transactions, the other is routing messages. Sometimes the Bitcoin transactions come with a weird or questionable (subjective) messages. Such is life. The major difference that I can see is that on a mail server, you can remove these messages. You can't on a Bitcoin server.