They will get every cent of their balance back and have absolutely no case on which to sue.
You don't seem to have noticed the part where Chase basically said "we
might give you back some money".
Either way, Banks still have to be regulated, controlled, backed and insured by the government. So the government has a lot to do with the banks. I doubt the government would let a bank confiscate a bunch of money just because it wants to. It has to be a court order or something.
you got no clue how the system works.. so here goes..
regulators such as fincen/FSA dont proactively shut down businesses. they work off of reports known as SARS reports given by banks and individuals where there is a real risk of a crime happening based on the best judgements of banks and individuals evidence at hand., so the FINCEN/FSA will never tell a bank to shut down an account, on a whim.
now stepping down the ladder to the level of banks. it is the banks responsibility to monitor its customers (not the regulators) and if a bank see's something dodgy or gets a complaint from a customer they are suppose to freeze an account and investigate the legitamacy of the business and or the complaint. the bank are not allowed to reveal to the bank account holder the exact nature of why they are being investigated.
once the bank has done its internal investigation and decided a crime has been committed then and only then would a SARS report be generated and FINCEN/FSA(SOCA) made aware of the potential crime. for further investigations to occur. if other bank account holders are involved fincen/FSA would suggest to those banks to begin investigations and if enough info is there to freeze the account then they will but only after fincen/FSA receive a SARS report with enough evidence to act on.
the banks don't freeze accounts on a whim, they have to have good reason. and even after the good reason they have to have enough information to make a sars report of an actual crime.
i repeat
fincen/FSA will not ask a bank to freeze an account on a whim. fincen/FSA need to have received a SARS report about the people involved to then get the banks to act.
take mtgox for instance.. they had a confidential informant send them a SARS report before anything happened to MTGOX
now the weakest point is the banks.. as they are the point where a account can be frozen on less legitimate reasons. and if a crime has not been committed they HAVE TO release the account.
the banks do not simply run away with the money on a whim.
it may be worth reading the regulations once in a while. so having a working relationship with the local bank manager more so then just one hand shake and a business plan you can quash any concerns the bank has and ensure your rating with the bank is not high risk.