Interac e-Transfers are only available in Canada for individuals who have Interac-partnered bank accounts (most of them). So, no you cannot use Interac e-Transfer in the U.S. That being said, Interac does have a collaboration with Mastercard and Western Union to allow Canadians to send International Transfers.
Interac Debit is made to be a simple, secure, and easy way to pay for your everyday purchases, and is accepted across Canada and approximately 2 million retailers in the United States.
They cited an increased interest for multiplayer and lack of time spent by the playerbase on the campaign mode as reasons why they shifted their focus. Black Ops 4 utilizes Blizzard's Battle platform for the Windows version instead of Steam, the first game in the series to do so.