Clearly then Facebook did provide more value for them than it took, otherwise why wouldn't they just be happy by the current situation now that their links are protected from the big man?
Also YouTube isn't just a link aggregator. News media usually have their own platforms with their own ads and monetization. And they still have them! So they are completely free to monetize their assets/content. Canadian media isn't entitled to getting services from Facebook and also demanding payment while doing so.
We can also infer that the effect is significant based on how much the news organizations are complaining about losing this free source of traffic.
On the other hand, FB is willing to block news links, which suggests they don't actually profit from them meaningfully. Nor does blocking them, or winding down the dedicated FB News product, appear to be causing any hit on their user or revenue numbers.
Now, you turn. How do you know that "FB heavily profits" from this?