Well decentralisation is hard, it's particularly hard when it's dealing with real peoples money, it's hard to scale and hard to maintain, Ethereum is getting closer and closer day by day to moving to an alternative system called Proof of Stake, it's a different system from Proof of Work, you may be familiar with Bitcoin and its energy use.
You can read more about issues on Vitaliks website for example when Musk tried to become a blockchain expert overnight he looked a bit silly:
You can read more about issues on Vitaliks website for example when Musk tried to become a blockchain expert overnight he looked a bit silly:
https://vitalik.ca/general/2021/05/23/scaling.html
Vitalik is probably the only Billionaire in the world I don't hate and ethereums innovations are incredible.