No, it's not renting. As I mentioned, it won't require a personal investment of your own. Your investment will be your own time. We are talking about delegation services where you play a deck and split the rewards with the owner. That is the best way to play and earn from the game, for players who can't afford to buy cards themselves.
Renting is also an option for those that can afford the initial rental costs - although with renting, you wouldn't be sharing rewards;)