And third, it will make it easy for mid-tier or small-tier subgraphs to get indexed and discovered, whereas this would be more difficult if they posted directly to The Graph, he said.

Subgraphs in The Graph directory number 2811. Many of the well known DeFi protocols use their own subgraphs, they include Uniswap, Synthetix, Aragon, Gnosis, Balancer, Livepeer, DAOstack, AAVE ...