Yes it is, that is exactly a free market.
'Investigating' people and banning them for market participation is not a free market.
I'm guessing you lost money. If so, take it on the chin. Holding and trading bitcoin is a risky business and you knew what you signed up for.
Nope. I was in fiat at the time of the crash.
I simply do not like this type of erratic market manipulation. It is bad for bitcoin's and bitfinex's image.
How will people take bitcoin serious when it still has 100 dollar moves in a day on one of its major exchanges? It's embarrassing to be frank.