Alt chains are compromised pretty much daily. North Korea loves how unsecure turing complete "defi" chains are. Due to this, they've even stopped targeting centralised exchanges.
“Finding security flaws in brittle DeFi “smart contracts” seems like shooting fish in a barrel.”
https://securityboulevard.com/2022/10/3-billion-defi-hacks-richixbw/
https://decrypt.co/86503/defi-users-lost-billion-theft-fraud-2021-mostly-ethereum-report