The whole POW Model needs the network to be very busy just for security and to function
It reminds me of when NXT got released and BTC miners worked out it was more profitable cracking NXT loggings then mining coins themselves lol
If mining isn't profitable then no one will be mining bitcoin so it literally means the miners are making profits and the profits depends on their expenses and current market trend, as of now we are in bear market we can't expect much to make but one who keep holding until the reversal of market will make huge money, but with one rig you can't make millions you needs lots of them to create more hash powers but generally no one is started doing mining because of the prices of those things are getting crazy high day by day so one who did as early as possible are making thousands of dollars a day or even for an hour.