This is known as the "nothing at stake" problem. This 2014 blog post by Vitalik Buterin discusses it: https://blog.ethereum.org/2014/11/25/proof-stake-learned-l

This is known as the "nothing at stake" problem. This 2014 blog post by Vitalik Buterin discusses it: https://blog.ethereum.org/2014/11/25/proof-stake-learned-love-weak-subjectivity/ https://blog.ethereum.org/2014/11/25/proof-stake-learned-lov...