They don't cause centralization.
Really? So you think that one person/group controlling 1000s of mining machines where they can achieve more than half the hash rate isn't centralization?
nope.
I see.. Well either you're not all that bright since that's exactly why Satoshi designed what he did, or you have an ulterior motive for spreading that fallacy. Either way, not like it really matters since it's all going to end up being centralized so good luck to you.
At first, most users would run network nodes, but as the network grows beyond a certain point, it would be left more and more to specialists with server farms of specialized hardware.
The design supports letting users just be users. The more burden it is to run a node, the fewer nodes there will be. Those few nodes will be big server farms. The rest will be client nodes that only do transactions and dont generate.
At equilibrium size, many nodes will be server farms with one or two network nodes that feed the rest of the farm over a LAN.
https://satoshi.nakamotoinstitute.org/emails/cryptography/2/https://satoshi.nakamotoinstitute.org/posts/bitcointalk/188/