I'm not entirely sure what you mean by "Pi mining networks," but if you are referring to the cryptocurrency Pi, then it is a real digital currency that was launched in 2019 by a group of Stanford graduates. Pi is designed to be mined on mobile devices, and its creators claim that it is the first digital currency that can be mined on a phone without draining the battery.
However, the legitimacy and viability of Pi as a long-term investment or currency is still a matter of debate. Some people believe that Pi has potential, while others are skeptical of its claims and warn of potential risks associated with investing in a new and untested cryptocurrency. It's important to do your own research and exercise caution before investing in any cryptocurrency.
Lol, it's in no way a real digital currency neither it was developed by Stanford graduates, these are all lies and only done to create community hype and get a lot of users to make their app and website popular and finally to get phone numbers, emails, and KYC information of users that they can use for their own benefit, might even sell them to third-party advertisers for money.
It is not a trusted project and most obviously just a scam that will never really have any coin released in the market because if it was a real project, it would never take this much time for it to release in the market or at least have an ICO or something.