How Does a Consensus Mechanism like PoA Aim to Prevent Malicious Forks?

PoA prevents malicious forks by making them economically unfeasible and requiring coordination between two distinct groups. An attacker needs to control both the majority of hashing power (PoW) and the majority of staked capital (PoS) to sustain a malicious chain.

The stakers, motivated by their capital investment and potential slashing, are incentivized to sign only the legitimate chain, thus quickly invalidating any malicious fork attempt.