It's also worth to mention 3070 is GPU for desktop, not laptop. Other website such as https://www.nicehash.com/profitability-calculator doesn't provide profitability for laptop's CPU or GPU either, which means we can't get somewhat accurate estimation.
Yeah. I have to agree with you and Stompix. But you know, there are some peoples who does not really cares about their laptops, desktops because either they did not buy it and got it as a gift from their parents, or it's their office laptop or desktop which they are going to use. So, they do not really cares if it's a big deal or not. They might need some extra money no matter how it comes. I often see teenagers use their devices like it's worth nothing. They do not really care if it will break or something. They will get a new one from their parents. But yeah, If you compare to the investment, it does not worth mining with a laptop.
At least for device given by office or place they work, it'll raise question if it break quickly or may contain monitoring software.