The entire trend in 2017 happened because of Bitcoin's futures, Ethereum's ICO craze and the insane BTC ponzi scheme Bitconnect.

All three combined fueled the crypto fire and they all collapsed around the same time as people started shorting the market, dumping physical BTC, and getting rid of tokens as fast as possible to reclaim profits.

I got burned big time in 2018 because of the bear market but I also still got out in the profit zone thankfully.