1. less of an issue as time goes on. regardless, not much can be done with a 51% attack anyway.
2. not really an issue. every argument ive seen about centralization misses key points on how they are wrong.
3. Pruning.
1. ASICs & Mining facilities. 51% lets you do anything from ruining the currency to implementing modifications to the protocol.
2. Centralization makes it a lot easier to make a 51% attack, but besides that, centralization could result in governments taking over bitcoin and destroying every single one of its benefits over fiat.
3. Reduces the security of bitcoin.
ugh.. you really need to look into this yourself. Ignoring uses with a bright yellow "ignore". its lit up for a reason.
1. Thats not what a 51% attack is and doesnt let you do that. do research.
2.bitcon isnt centralized, pools are false centralization. ie. if someone pulls some shady stuff, the people 'get out of the water' and they lose the hashrate and peoples faith in them, pool owner then loses their income stream. any other form of centralization is just as much BS. do research.
3.no it doesnt... do research...