I don't believe that mining Pi will use resources like CPU or GPU of your phone, that thing works like cloud mining and the project is blah blah to me, never going to waste my time on such ever again, I believe everyone hyping this project knew too less about crypto projects and shitcoins, sorry for my mean words
I don't believe on it either but it consumes the power of your phone that's why it drains battery and lessening its life span. It's just a show that they are allowing you to mine.
But that's not really mining at all.
Pi don't use your phone's battery or CPU power to mine. It's just a pre-defined amount set within their algorithm that you get after specific time duration. So it doesn't cost you anything to mine Pi.
I used to mine Pi earlier but now they have started showing their true colors. Everyone will have to comply with their KYC rule to withdraw and use Pi token. Which is really absurd so I am not using it anymore. For a token which is not listed in the market and doesn't require a dime to mine, complying with KYC can be a costly mistake.
But once you activate their app, it will consume your battery. Now that they're asking KYC, well, that's the downfall or they really are going down because there's no concrete plans.