What is the main thing OMG is doing, that Polygon is not doing, to be called a Layer 2?

One of the key distinctions for a Layer 2 is that it derives security from Ethereum itself and therefore we don't need to run our own suite of validators because we're not an independent side chain or proof of stake protocol. Everything is secured by Ethereum. Now there's no free lunch in a world. We need to pay Ethereum for that security, but that's the trade. I can't comment on Polygon. They would need you to speak to their own architecture. But if you look at how low their fees are and the fact that they have their own set of validators, it's a fundamentally different architecture altogether.