In recent months, a raft of alt-L1s joined Ethereum to become L2s, even as other projects on L2s switch back to the Ethereum mainnet. The Ethereum L1 is reasserting its claim to be the home of high-value DeFi — it has seven times more TVL than its nearest rival — while the L2 model offers millions in potential savings, along with network effects for alt-L1s that join the ecosystem.Back in March, when bearishness around the “extractive” L2 roadmap was at its peak, mobile payments network Celo quietly closed down its validator network to become an L2. Now, it’s saving almost $7 million a year in operating costs.