Gambling is entertainment that costs money. For a minority of people it stops being either, and the point of this page is that the signs are recognisable before the damage is.
Any one of those is worth pausing on. Several together is worth talking to somebody about.
Deposit limits are the most effective single measure because they act before the decision rather than after it. Set one while you are calm, at the lowest figure you would be comfortable losing in a month. Every licensed operator must offer deposit limits, session reminders, cooling-off periods and permanent self-exclusion, and using them is routine rather than an admission of anything.
One point specific to this site's subject. Because an Interac e-Transfer cannot be reversed once claimed, it removes the accidental brake that a declined card or a pending payment sometimes provides. If you know you are prone to depositing impulsively, the speed of this payment method works against you, and a deposit limit set at the operator is the countermeasure.
Supporting someone who is gambling too much is exhausting and you do not have to do it alone. ConnexOntario and the provincial lines support affected family members, not only the person gambling, and taking that call is a reasonable first step.