re: People buying these Crypto Currencies

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Isn’t that centralization via Etherscan?

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Yes. Ethereum the blockchain is very well decentralized, but the tools surrounding it are lacking decentralization. It's difficult & expensive for those tools to scale, so the centralized services came online first with bigger funding. Decentralized options are starting to pop up; for example, for an RPC provider there's now Pocket Network that competes with Infura, Alchemy, and others. For block explorers, there's one in development: Librescan


It is an expensive and difficult endeavor to keep track of and store every block transaction over the last year or so. So far, no decentralized options for block exploration have succeeded. There are multiple centralized block explorers, however, so data can be validated by a service through multiple explorers. A list of block explorers

In addition, node operators (most large projects will want to run nodes for efficiency) can look up data directly on the blockchain if they have things like transaction IDs and addresses.


All this is to say: The block explorers are not decentralized (yet), but there's enough competition and people watching that it'd take a really large coordinated effort to have all of these options show the same bad data. The data is very trustable.