Oh okay. That gives some perspective to what I read. I almost certainly misread it. I’m a novice when it comes to cryptocurrencies.
The most effective bit mining rig today is an Android rig that uses 288 graphic SoC processor chips working in tandem all in one computer. It's basically a miniature supercomputer using the 288 graphic processors to mine for the cryptocurrencies. They cost about $2500 apiece without power supplies and cooling fans.
Pay back time a month ago on that rig was a little over three to six months. . . depending on which cryptocurrency you were mining. . . at a return of $400 to $700 per month. It is likely higher in return now.