hypnosec writes: E-Sports Entertainment Association (ESEA) League has admitted to embedding Bitcoin mining code inside league’s client software. What began as an April fool’s day joke, the code ended up mining as many as 29 Bitcoins worth over $3700 for ESEA league in a span of two weeks. According to Eric Thunberg, one of the League's administrators, the mining code was included as early as April and tests were run for a few days after which they "decided it wasn't worth the potential drama, and pulled the plug, or so we thought." The code was discovered by users after they noticed that their GPUs were working away with unusual high loads over the past two weeks. After users started posting on the ESEA forums about discovery of the Bitcoin mining code, Thunberg admitted to existence of a problem – a server restart for "a setting getting changed which enables it for all idle users."