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Probably the fact that @dan keeps posting about EOS, while sometimes giving out unsolicited corrections about steem. Also, this is a spill over from long standing disagreement between ned and dan, based on, but not limited to SMTs, linear/super linear vote curve or something, amongst others as listed by ned a few weeks back in one of @dan post.

tl;dr: Dan is the smart one and Ned is jealous and lost without him, and in big trouble now.

personal feud... in my opinion