The video discusses Polygon's “aggregation layer” (AggLayer) which aims to connect different blockchains and rollups to share liquidity and state.
Chains can use different execution environments, data availability layers, and virtual machines but must settle on Ethereum.
The AggLayer provides “shared security” by tracking balances across chains to prevent theft even if an individual chain has a soundness bug.
Interoperability between chains can happen synchronously or asynchronously depending on needs, with the AggLayer enabling low-latency and trustless transfers.
The long-term vision is an “app chain explosion” where many specialized chains plug into the shared liquidity rather than competing for it.
Revenue for Polygon may come through operating public chains and fees paid by other chains to the AggLayer, but focus is on growing the ecosystem over short-term profits.