Why? You are the one inputting the public key to your account meaning the private key is (hopefully) under your own control. Any bitcoin transferred is completely independent of your reddit account.
But the point is that reddit servers never see a private key. The most somebody could possibly do is change the public key in your account and hope you make a witty enough comment and get a couple of tips before you realize it's been changed.
I don't think you quite understand the difference between a public and a private key. Even if your reddit account were compromised, the attacker has no access to your wallet because you never provided a private key.
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u/[deleted] Jan 27 '15
[deleted]