Hilariously I saw an article this week about how Buterin was saying he was worried about Bitcoin because it is proof of work, saying it can't sustain itself and it will be easy to attack in the future. Just shows that all the founders of centralized blockchains are just out to promote their own thing. Now that Ethereum is moving to PoS Buterin feels the need to try to flip the reality and claim that PoW is insecure while PoS is better lol
Unfortunately he has been doing this for a long time trying to make his malicious hard fork look legitimate so that the foundation can make money for not doing anything except holding the premined coins.
This is exactly why we have been seeing a lot of PoS topics pop up about bitcoin for the past year (more or less).
I don't have anything against PoS. It is better for centralized blockchains
Specially if their blockchain is not immutable. After all they can easily roll back blocks again at any time they wanted.