
Casper introduces the problematic concept of “inactivity leak”, where nodes get penalized for the mere crime of going offline. Whether you’re intentionally going offline to cause harm or not, it doesn’t matter. This is a super perverse rule because a) it introduces a new vulnerability where an attacker can DDOS honest validators into going offline & cause them to lose money and b) it potentially discourages nodes from staking for fear of losing money. This has a negative impact on overall security, since staking participation is extremely critical to PoS (more on this below).