Yes, because it has no private key when we use wallet like coins.ph. There are many hackers in this cruel world so please take care of your bitcoins, don't let them hacked your account.
Hackers can hack everything. To live too bad. You can die from it. Lol! Pay attention to the causes of the break-ins. In all cases, is primarily to blame yourself. If you always follow safety rules then it will be much harder to do. I think that online wallets are always more difficult to hack than your computer.