Ethereum L2 isn't an independent chain built from scratch; it's an extension layer anchored to Ethereum L1. Generally speaking, using Rollup technology (like OP or ZK), data and settlement ultimately roll back to Ethereum L1, inheriting Ethereum's decentralized security model. In other words, even if Polymarket as a company runs into issues, the chain itself won't 'crash immediately,' because assets and states are rooted in the Ethereum mainnet. Users can forcibly withdraw funds via L1 or wait for the challenge period to end. Of course, early-stage L2s aren't without risks. There are two main ones: first, the centralized transaction sequencer, especially in early L2s, which often rely on a single sequencer. If this node is attacked or the company controlling it encounters problems, the chain could experience short-term interruptions. Second, multisig risks, which are a common pain point in most L2 ecosystems. L2s often have security councils or multisig setups controlling upgrades, and if these keys are compromised, the liquidity of the entire chain could be at risk. If Polymarket as an entity gets 'taken down' (e.g., due to regulatory crackdowns), the operating team might be unable to maintain the sequencer, leading to temporary downtime. However, the chain's code and data are open-source/on-chain, so they won't completely disappear, and assets can still be withdrawn to L1. Compared to relying on Polygon, Polymarket building its own L2 actually reduces external dependency risks. Polymarket can customize its execution environment, avoiding congestion or failures on shared chains.