Bitcoin is described as 'Peer-to-peer digital currency. Peer-to-peer (P2P) means that there is no central authority to issue new money or keep track of transactions. Instead, these tasks are managed collectively by the nodes of the network' and is a leading cryptocurrency coin in the bitcoin & cryptocurrency category. There are more than 50 alternatives to Bitcoin for a variety of platforms, including Linux, Mac, Windows, Web-based and Android apps. The best Bitcoin alternative is Monero, which is both free and Open Source. Other great apps like Bitcoin are Ethereum, Litecoin, Bitcoin Cash and DASH.
This looks really weird to me, hard to tell if that's a scam since nobody buys Pi but my hypothesis is that the apps collects some data about you to sell them to data brokers and gave you in exchange a premined shitcoin that nobody accept as a payment method. Maybe number will go up but this as ZERO usecase in my humble opinion.