My experience: clients want to use Canva for everything; designers don't.

This has a reasonable shot at eliminating reasons for designers to pass complex work back to Adobe's suite. If they disrupt Adobe's dominance at the professional end of the market, it puts Canva in a very comfortable position.

I imagine enough folks will pay for the Canva account subscription to upsell - and then it's also a funnel into Canva

Plus it directly attacks Adobe's moat if a solid desktop app competitor is free

As long as Adobe is charging huge amounts of money, it seems like a free desktop app that competes with that and integrates with the existing Canva ecosystem would be worth it.