This is "referral coin" and team is basically asking people to find as much referrals as they can (they have 4 million users as far as I know) and I suspect this is some kind of attempt to collect as much private information they can.
There is some "phone-mining" going on, but tricky part is that if you want to receive Pi coins you will have to provide them your KYC otherwise your "mined" coins will be removed (note: it is not known what happens to removed coins). Nothing really explains how they can remove coins which someone mined, but if they can do that I wouldn't go near this. Imagine, you mine bitcoin and satoshi remove them because you didn't provide them your private info

Ask promoters "what is purpose of this coin, where will I use it?", I am pretty sure not single one of them knows the answer

If you stop asking questions and Join you'll find out millions world wide chat in the app chat-rooms!
Its all in the White Paper and FAQ!
The purpose is for everyone in the world to be able to afford it and to be able to use it with app because mostly everybody in the world has a cellphone. The are creating a Market place and a social Media Platform already which has 4+ Million users world wide! KYC is simple it forces Bad Actors that try to make farms in a room with hundreds of fake accounts on phones(those Pi Coins with just never make it to Phase3. We don't want to be like Con-coin(bitcoin) that has bad actors(Big Corporations Farming in warehouses) average person can't compete!
If you stop asking questions and Join you'll find out millions world wide chat in the app chat-rooms!
Its all in the White Paper and FAQ!
The purpose is for everyone in the world to be able to afford it and to be able to use it with app because mostly everybody in the world has a cellphone. The are creating a Market place and a social Media Platform already which has 4+ Million users world wide! KYC is simple it forces Bad Actors that try to make farms in a room og hundreds of fake accounts on phones. We don't want to be like Con-coin(bitcoin)

that has bad actors(Big Corporations Farming in warehouses(average person can't compete)!