Price rising morew than X10 on the peak and many people fix they profit. Its a free market, sell if you want to sell or buy if you want to buy. And hodl if you want to hodl
I prefer to read between the lines rather than adopting "free market" cliché statements.
It would be a free market if there would be more exchanges trading zero. Trading in only one rather average to small volume exchange, allows price manipulations by big whales.
I am not blaming anyone wishing to cash their profits, I am only being skeptical given the time chosen for someone to sell that kind of volume, granted we are waiting for an important update tomorrow, which could bring the price even higher.
Also, given that the price is fluctuating between 28 and 34K satoshis in the last few days, that someone who placed that 20k zero order could have sold at even higher prices without making this kind of wall.