After pulling off the hack, the attacker received the usual flood of on-chain messages from people asking them to share some of their ill-gotten funds. Unusually, the attacker followed through, ultimately sharing 19.5 ETH (~$36,000) out of their spoils.
Onyx is far from the first Compound fork to fail to patch known vulnerabilities and suffer hacks as a result. Hacks stemming from known Compound bugs, such as the attacks on Rari Capital and Sonne Finance, have netted tens of millions of dollars apiece for attackers in the past.