I'm not a technical guy but I think that what you are saying is totally false.


First of all, Bitcoin is still decentralized as always. Its just that rich investors, exchanges, and miners are owning more than an average person since they have many fiat money to invest into it. Its the same as paper money that rich people are owning most of it but the only difference is that Bitcoin is decentralized while the other doesn't

Yes big companies does have access to Bitcoin mining so it is not dead. Simple, they have money to invest to Bitcoin mining that is why they are mining. Go to China and you will see many miners there. Bitcoin mining isn't dead.