Remember Plus token?
It was a gaint ponzi that at one point got 1% of the whole bitcoin supply. For couples of months via the use of mixers and OTC china trades they dump on the open market
They used more coins such as eth and eos. Bitcoin was just the largest one for them.
And looks the dumping is going to start
https://decrypt.co/33095/alleged-crypto-ponzi-plustoken-withdraws-67-million-in-eos
BIG oof is all I am going to say.