I recently purchased 30 TH/s SHA-256 cloud mining from Hashflare for $5760. (I first purchased a small amount and was impressed by the results and then got more.)

It was profitable before the halving and the forecast revenue was 24 BTC ($16000) per year.

The bitcoin halving was a catastrophe.

Now I'm receiving 0.034 BTC ($22.61) per day, from which 0.027 BTC is deducted for maintenance.

What remains is only 0.007 BTC ($2.56) per day. It will take 3.4 years to recover what I had paid.  Then it's almost time for the next halving.