Yep. If they believe these platforms are cost-effective ways to advertise, then actually choosing not to use them for public funded advertising would be an abuse of public funds, unless they can explain how it is different, which I'm sure they can't.
Right. For better or worse, Meta currently gives cost-effective targeted advertising. Would be interesting to see a graph over time of Canadian govt advertising spend, split by channel (newspaper, TV, radio, online social media, email) and by outlet. I imagine OSM (and email) have cannibalized the older channels.