Right now at least, layer 2s are somewhat immature. Many of them do host billions in assets, but they each have different tech stacks backing them up that are a

Right now at least, layer 2s are somewhat immature. Many of them do host billions in assets, but they each have different tech stacks backing them up that are at varying levels of maturity and decentralization. L2Beat does a great job of breaking down the L2 ecosystem: https://l2beat.com/scaling/summary https://l2beat.com/scaling/summary Note the pie chart in the row for each L2. That pie chart notes the security risks for each one based on their tech stack. Ideally, the top L2s should strive to reach "Stage 2" which could be considered as secure as L1 itself, but no general purpose L2 is at that stage yet and most are still at Stage 0.