[mattdesl]

zk rollups tend to inherit most of the security features of L1[1] but with some trade-offs.

The trade-off is basically scalability (and thus fees). If the L1 network is so highly congested that each transaction costs $100 or more in the future, a scalable zk rollup that achieves about the same level of security at the cost of < $0.001 may be worth these tradeoffs.

[1] - https://zksync.io/userdocs/security.html#security-overview