NANO has been very volatile in terms of its BTC value for the last 4 months or more that I've followed it. The BitGrail hack/scam situation was pretty bad for NANO, as well as myself who had funds on Bitgrail at the time. The NANO team doesn't seem to care about the stolen funds and has decided to put it behind them and have all the blame and solutions be someone elses problem.
AFAIK, it wasnt the team's problem. the way i and many others saw it wass that Bitgrail was locking funds unnecessarily and the owner was being a tool and being dishonest with the nano team and the community. the NANO team made a response to it in a medium post. i've been following the devteam for quite some time and they have shown only integrity