That's very odd. I don't know if it's your bank, or something specific to Canada.
In the US the only limits are via the ATM or Debit card. If you write a check, go in person, or send a wire, you can withdraw as much as you want, with no time delay or restriction.
> Couldn’t they just use one of their terms or conditions to delay the withdrawals and give themselves ample time to react?
That's simply not a thing.