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.