Is it because Bitmain stopped mining with their miners and started shipping them out?
Or due to the flood in China?
We basically hit an ATH of difficulty last week.
Pretty sure that flood in China only affected the SHA256 ASICs which are only used to mine Bitcoin and Bitcoin Cash. However looking at the hashrate charts, it doesn't look like anything too drastic happened.
The difficulty for ETH will keep increasing since people are getting weeded out of mining ZEC due to the ASICs. Many 1080Ti's are going to switch to ETH in the next coming weeks since ZEC is no longer profitable for those GPUs.
Same reason why the XMR difficulty will keep increasing since many of the older AMD Radeon GPUs are switching from ZEC to XMR since the profits are identical but it uses less electricity.
Yep, the damage in Sichuan seems to only be Bitmain SHA ASICs, though I did notice one article about the flooding did show Vega GPUs, but those should have been mining ZEC/XMR. I suspect there may have been E3 ASICs in play as well, but probably not to an extent as big as the S9S and SHA miners, but the damage may have been enough to lower difficulty. I was actually in Chengdu when the flooding happened, and in my area I witnessed some of the heaviest rainfall I've ever seen in my life. Only found out about the flooding damage a day later.
If anything, Bitmain is continuing production of the E3's and difficulty will probably continue to rise on ETH even after shipping out the last batch. They're likely just going to make another batch with similar prices to the last one.