MicrosoftTimbo155 Ethereum is not PoS. It will be PoS when ETH2 launches in about 18-24 months. Right now, it's PoW, just like Bitcoin.
As for the 51% attack, I am not saying they will do it (they would be crazy), I am saying they could do it. What do we know of those 5 chinese companie that already control 49% of the global hashrate? Very little. But we do know that China is an adversary of the US. I don't want to sound the conspiracy theory alarm bells, but anyone ignoring this is pretty naive. That about 15% more of the hash rate is also concentrated in China and another 15% in Iran and Kasahkstan doesn't make this any better. That's 80% of Bitcoin's global hash rate in the hands of countries that the US is in trade wars with, sanctions, etc.
But as I said earlier, we can discuss the details of which chain is better or more secure until we fall off our chairs (like so many others already did before us). The point is: Microsoft did not state anywhere why they chose Bitcoin over any other chain. I was just curious about the reason (and I don't think it has anything to do with BTC allegedly but not evidently being the most secure chain).
