Then the majority of the faults are with datacenters and those large warehouse mining facilities not PCs. You can't compare an individual buying 5-6 cards with a warehouse getting 2000.
You don't need 2000 GPUs to run a private blockchain. It can be mined on a much simpler equipment - using much less electricity
And when the blockchain becomes too complex, you can simply start a new one. You don't have to use the same blockchain for years.
We use it to speed up fast response systems and distribute computing load. There's no point in keeping a blockchain beyond a point when the computing cost kills the reason we run it.
Large public blockchains got so complex by now that it's just not possible to use them in a fast system.
Then they're NOT decentralized. They're basically "blockchain by fiat".
If few companies run a system based on blockchain, each can run their own computing node. That's the idea behind running a distributed ledger.
It occurs to me ("fiat", "decentralized") that you may not know that blockchains aren't just used in alternative payment methods.
Nobody asked you to step into this thread...
That's the thing about public forums... from time to time someone crashes a self-pleasuring discussion and asks a difficult question.
I opened the discussion because it made me curious that someone still discusses ETH. And then I noticed a misunderstanding in your comment so I tried to... help? Share some knowledge?
You don't want it... your choice. But don't worry, I won't stay long.