If your laptop has a dedicated graphics card, you may find some minable algorithms. A quick search from whattomine.com shows that if you have a 3070, you can mine the ZelHash algorithm and make $0.35 a day after the electricity cost. This is not much, but surely you can use it as pocket money.
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.
$0.30-0.35 profit per day from a laptop will be a very bad deal when it costs $1000. $110-130 profit per year and you still need to have electricity at a price of 5 cents. Such profit cannot be used as pocket money, or only once a year, if the laptop does not break.
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.
