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"it only takes four entities to disrupt #Bitcoin and only two to disrupt #Ethereum. Additionally, 60% of all Bitcoin traffic moves through just three ISPs"
https://www.techrepublic.com/article/pentagon-finds-concerning-vulnerabilities-on-blockchain/
Check out the report: "Are Blockchains Decentralized? Unintended Centralities in Distributed Ledgers"
https://assets-global.website-files.com/5fd11235b3950c2c1a3b6df4/62af6c641a672b3329b9a480_Unintended_Centralities_in_Distributed_Ledgers.pdf