A thief however can still dispute they never made the charge. "It wasn't me, I have no idea who this Bitcoin hacker guy is, or how he stole my money but I never made these transfers. Please Mr. Bank Customer support person they stole all my money I can't pay the rent unless I get this back".
I would imagine this scenario would only work once per bank account. After that, the bank would be onto the scammer's MO. The 2nd and subsequent claims by a person doing this scam from their own account would be treated with extreme suspicion by their bank. It would have to be a decent amount of money to be worth burning one's own reputation with their bank to try this scam.
I also find it amazing that there are many legitimately 'hacked' bank accounts in Canada. I've been using online banking for years in Canada with no problems. I would think their security would be heavy duty. I know if someone hacked my account and tried to do an Interac e-Transfer out, I'd get a phone call from my bank.