The goal of this strategy is to have a super farmed carry. But to do that, the 4 heroes must secure their carry’s farm. This is done if the carry can indeed do their job in the late game.
This strategy can be done in two ways. The first way is for the team minus the carry to wreak havoc onto the other team by pushing lanes, constantly ganking, and taking map control away from the enemy. This makes them deal with that problem while the carry is left to do whatever he damn well pleases. The other way is to constantly surround your carry, provide vision for them to farm safely, and come to their aid if the enemy team tries to gank them.