The main reason for this decision made by Ethereum founder are two publications made by CoinDeck. Referring to the first article, Buterin said that CoinDeck was “recklessly complicit in enabling giveaway scams”, referring to their publication on OMG (OmiseGo), an article containing a direct link to scam giveaways. In another article CoinDeck “revealed sensational info about ETH’s future hardfork”, referring to EIP999, which as it later turned out, had a very misleading information.
Crypto exchange platform OmiseGo joined Buterin in his boycott stating that: “We can’t in good conscience support a publication that puts its readers at risk through careless reporting and reacts with hostility rather than humility when the error is brought to its attention.”