No, mining profitability is not guaranteed to stay the same over time.
This Bitmain Antminer B3 (780Hz) currently generates a daily profit of approximately $0.00, assuming an electricity cost of $0.00 per kWh.
However, this profit can fluctuate due to various factors such as global hashrate, network difficulty, block reward, and cryptocurrency exchange rates. Be prepared for potential changes in profitability based on these market dynamics.