Polygon zkEVM is the leading zero knowledge scaling solution that’s equivalent with the Ethereum Virtual Machine, this means that most of the existing smart contracts, developer tools, and wallets work seamlessly.

Polygon zkEVM harnesses the power of ZK proofs to reduce transaction cost and increase throughput, all while inheriting the security of Ethereum L1. So this is development for support blockchain on layer 1 it's nothing special because many layer 1 show up and transaction is very chep than polygon such XLM and AVAX, especially their product rebranding as "POL" maybe they have startegy for avoid  SEC lawsuit in the future not as polygon but as POL