They had a big party on Wall Street on CMA futures first day in 2017. Next month they all went short.
Most rational investors and traders outside CME did the same thing. People blamed the CME for dragging the price down but it was just the bubble that popped. It also happened before when there weren't even futures.The interesting part however is the timing. Bitcoin has always been an extremely poor performer in the first couple of months of each year (look up the charts and you'll see what I mean), so they may have launched intentionally in December of 2017.
If you also add that people bought the rumor and would very likely sell the news, then you know that the odds of a correction to happen were extremely high. Poor people who bought the $20k peak.
So you agree that CME futures had a part to play in all this or not? I don't quite understand from this answer. I didn't say it was the main reason although usually when futures land on any market, this is already a bubble ready to pop. So I guess your point is logically correct, if I fully understand it. I have been looking the charts for several hours, every day, for more than 3 years. Although I don't see how December as a month has something to do with price or charting. I've seen trends happening in certain months for a certain reason but I don't see a December case. If you go back to 2011-12 it invalidades this. You need way more than two-three years to make this claim. What you are talking happened only in 2013 and 2017. Perhaps it will happen in 2021 again and next bubble will pop Jan 2022. This wouldn't prove a case either.