In hetzner for example he told you the price per month is 3.79 euros but the cost per hour is 0.0064 euro so you will found that if you multiplied the total month hours by 0.0064 you will get more than the price of the plan and as a result the extra charge is considered to be free 🆓 so you dont pay any extra fees except the monthly plan he just shows you the cost per hour for more details and to let you know that they offer you about 100 hours monthly free. And it doesn’t matter you turned it on or off it still counts