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.
What is that difference between 1000s of mining ASICs, 10000 of mining GPUs and 5 people controlling half of the coins in a PoS system?
For as long as there are poor and rich people, centralizion will keep occurring in one form on another.