The process through which cryptocurrencies like Bitcoin and Ethereum generate new coins is regularly criticized. Each blockchain had its network of miners using specialized computers on every continent, crushing mathematical equations to validate transactions before the blockchains were merged. Referred to as the Proof-of-Work (PoW) consensus, it uses a lot of energy (electricity) and is one of the most well-known targets for criticism.
It is noteworthy that there has been a load on the US and the EU to restrict Proof-of-Work (PoW) digital assets, with the EU coming close to accomplishing this in March. Significantly, those who oppose digital money, like environmentalists and politicians, regularly compare the energy use of Bitcoin and Ethereum to that of small countries.
The Ethereum upgrade has put Bitcoin in a dangerous position. The market leader is the only cryptocurrency asset that continues to use PoW. There could be increased political pressure on Bitcoin to adapt if Ethereum and other cryptocurrencies successfully integrate, or else it would be subject to highly limiting legislative restrictions.