I don't want to be a downer, but realistically considering the impact of this Canada is probably going to have to acquiesce at least temporarily.
Trump is applying cold, calculating business logic to this; Canada needs to do business with the US to a large degree, if that becomes costly their (relatively) small economy becomes less viable without reform which they don't have time to implement.
Don't get me wrong, I'm 100% behind Canada in fighting this but realistically it's not a fight they're going to win.
DNS-based Adblock like NextDNS (paid service), or PiHole (DIY option). Sadly that won't skip sponsored segments though, you'll still have to hear all about whatever scam or wish.com garbage they've decided to shill.