If you critize Ethereum, please do it in a way which is not embarrassing for us. Your last sentence even seems to contradict you even though I can see how you actually meant it.

A decentralized world computer could be useful for permissionless, heavy computations. You want to compute something heavy but none of these centralized organizations allow you to use their infrastructure? Use this. Also, the system can easily scale by just adding more or less nodes since the system is inherently designed to support this.

Not arguing that Ethereum actually is this. Just explaining how a "decentralized world computer" could be pitched without being a "paradox".