For the calculation, I take the price of electricity at $ 0.04 per kilowatt. This is the price of electricity in my city (Russia)
With the firmware, this ASIC will give $ 3 profit per day.
Getting $ 3 profit from 0.8 kilowatt seems to me not the best idea, and if you pay more for electricity, then it is not interesting for business.
In 24 hours on 3 machines I made $11.98 total is all prices are good each month 3 should make about 135-150 profit @ .12 kw.
So if you have a large number of them sitting around that is a decent profit a month.
The must be a lot of the E3's in Russia that has been the biggest country the mod is being bought at the moment.
Now one RX 5600XT video card gives 90-100 dollars of profit per month, with a consumption of 100 watts

The main problem is that no one knows how long this holiday of generosity will last.
Now it is profitable to mine even on Antminer S7-S9 if they exist, but I think you should not buy them for mining.