Pi Network has absolutely exploded from a mere 1000 users in May to 1.5 million now. Pi is building a fork of the Stellar Network and an attention based marketplace aiming to be the world's most inclusive ecommerce marketplace. In development by some pretty smart Stanford Phds and even a faculty member, Pi isn't the junk/scam product so many have thought it to be because of the "free crypto" label attached to it. The fact is, Pi isn't entirely free...it takes a miniscule amount of your attention to reset the app each day, but you'd be surprised by the number of people who sign up who can't even be bothered to do that. Also, this app does not mine Pi forever. It's only during the first phase. Soon Pi will be validated by node holders and the phone mining (which isn't exactly real mining of course) will end. So phone mine for free while you can. You need an invite...you can go here and if it asks you to input a code, use CryptoScrimper