It can disappear in a nano-seond. Stay away from that crap.
Bitcoin is on a global decentralized ledger. So long as you keep your private key safe no one can manipulate the entry showing you (through your key) hold X bitcoin. Bitcoin is thus far, far more secure than any centralized financial system like dollars/euro/yen that can be zeroed in an instant by a hacker or a government needing to do some asset confiscation.