People already said, but I have something to add
Most of this decrease in hashrate is because China are banning mining operations, and now this time is real.
If you search for China bans BTC mining, you can see some miners shutting down Asics
And not only BTC, but a lot of GPUs farms are off right now, miners are moving to another locations, like Kazakhstan.
In a few weeks the hashrate will return to previous levels, for BTC and ETH for example
And I see a lot of gamers are stop mining at this price of ETH, people who mined with 1 GPU or a couple and pay high electricity rate, is selling GPUs and gaming again, this is a trend in my country right now
I know farms are the big deal here, but there are thousands of gamers that mined some ETH
All this above are reflecting on price, now is the perfect time to hold, mine as much as possible to the next cycle
this is very true.
I have sold 1 and 2 rigs since 2012.
designed to mine and to game.
so let say I sell a rig to a guy in New Jersey.
I set it up with usb stick as first boot choice and it goes right to simplemining os and mines.
if the guy wants to game just shut the rig off pull the stick and and it boots to the windows ssd.
many guys mine 12 hours a day.
and game 12 hours a day.
new jersey is now on summer power rates say 20 cents.
so a 300 watt rig burns 4 kwatts or 80 cents
it earns 6 cents x 60 = 3.60/2 = 1.80-.80 that is 1 dollar profit.
and it make the room hot
the nj guy may turn the rig off.
the cali guy at 40 cents is at
1.80-1.60 = 20 cents
he is out.
I sold a lot of rigs over the years.
I know a lot of guys mine and game and I know almost all the guys with 40 cent power are not bothering to mine