No, it's for everyone. Just trying to figure it out now. If you pick a specific card in your collection there's now a Delegate button.
Jarvie and Asgarth (the peakmonsters team) are working on a marketplace; so it looks like we'll be able to give them authority to delegate on our behalf, and they'll send us the income (minus a small admin fee). Very early days though. Delegation is literally 15 mins old :)