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They make up nearly 80% of all clients.

If they wanted to, could they rearrange blocks and mess the blockchain up?

Are they a threat of decentralization?

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    They? Who's "they"??? The nodes are not owned all by the same person. Sure, somebody could release a version containing a "backdoor" or something similar, with a very small chance of going unnoticed by the entire community (since it's an open-source). But even that case would be considered more of security threat rather than a decentralization threat (unless the hack is designed with inter-node communication rather than for messing up the local host itself). – goodvibration Sep 3 at 1:59

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