mebIt's actually an ingenious idea (gamers usually have powerful gpus), but, as turts pointed out, the implementation is terrible. If an opt-in situation to generate income for themselves and the prize pots was provided, ESEA would still have my limited respect, but the fact that his bitcoin code slipped into the mainstream ESEA client build and was distributed to the public reveals a very spotty moral code that I would contend he is trying to mask by claiming amateur mistakes - despite the organization developing this software for some time.
Basically, I feel, especially as a software developer myself, that this is a breach of trust that will never be mended. It makes me especially wary of what else ESEA client is doing while it runs in the background.
Let me play devils advocate:
If I'm understanding lpkane's reasons, then the bitcoin miners nested inside the client were part of an experimental update (likely thinking along the same lines as you, with an opt-in system) that accidentally found its way into the publicly released version. I could buy that. It's not a very satisfying explanation but it is a feasible one.
Really I think a lot of this could be the result of bad PR. lpkane shouldn't have made his first post until he'd confirmed the numbers he ended up with in his second post. It called the legitimacy of his explanation and the severity of the infraction into question. His glib responses to the outrage aren't helping much either, but, once again I have to sympathize with him when confronted with the torrent of angry, profanity filled comments from CS players.
I find the idea that ESEA was secretly hijacking their customer's computers to farm bitcoins to be unlikely. There was no way it wouldn't be discovered, not when the people they're deceiving are so highly computer literate. It would only cause permanent damage to the company for a relatively small gain. Why would a company that's been around as long as ESEA have throw their customer base away like that?
tl;dr:
Maybe the bitcoin miners were from an experimental opt-in program that got mixed into the public client,
Maybe bad PR obfuscated ESEA's defense, and cast them in a bad light,
The cost for ESEA if they attempted to hijack customers' PCs for mineing would have been exponentially higher than the payoff, so doing so makes little sense considering how established ESEA is.
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I'd like to consider myself completely neutral, since I wasn't affected by this at all, and didn't even know what a bitcoin was until this happened and I went and read up on it. This is just my interpretation of ESEA's defense.