This is the only case I know of where Bitfinex locked an account. I don't know the reason, or if it was because he had been trading in too many coins. There is an option to give them KYC documents when you register so they must do some KYC checks, and that suggests to me they could lock your account whenever they want. That post's from the Bitfinex support thread, and if you skim through the whole thread it could show if others had their accounts locked.
BITFINEX !!!
I have most of my coins there and need to trade right now and I get this stupid message
"Your account is currently on withdrawal hold. Your withdrawal(s) will be locked in a Pending Approval state until the hold is lifted."
I can not move any of my coins IM so furious this site went to crap.
withdraws take over 12 hours to get processed the past times for me.
I did NOT change my password nor changed anything !
editBitfinex's terms of service say it can lock anyone's account if they are accessing Bitfinex through a proxy service or Tor.
https://www.bitfinex.com/pages/tosBITFINEX reserves the right to block access for any user accessing the Website via proxy service with intentions to conceal originating identity. This includes access via the Tor anonymity network.