Initially, when PI Network created a lot of hype, I was skeptical about it. Because where people are investing huge amount of money to build mining rig, how can it be so profitable for its miners only through mobile mining? However in the beginning I also mined with its hype but after a few days it didn't seem very safe to me and so its stay on my phone didn't last long. Anyway, I think it will eventually come out as a scam, so I will tell everyone not to invest in it, also don't let it place on your mobile.