I dont think its a scam, they are not raising any ICO money, besides the community is growing mostly via communities,who are letting others know about the project. with over 3 million people already downloaded the app and over 100000 applied for running nodes when its ready.
you can read more here: https://www.cryptotapas.com/pi-network-is-gaining-traction-is-it-worth-mining/
also:  https://www.cryptotapas.com/should-i-mine-pi-network-coin/

Yes been a part of the community for quite sometime now, and I think this coin has some potential.
Been part of some communities which seemed promising but later fell apart during execution
thi project has gained an immense traction over the time,with over 3 million downloads, and 100000, users applied for Node, when its due.
Read more about it here: https://www.cryptotapas.com/should-i-mine-pi-network-coin/
https://www.cryptotapas.com/pi-network-is-gaining-traction-is-it-worth-mining/

A point made, but would have been a good point, if the thread's author provided more information on how this can be a scam..rather than simply stating it  as a scam.
You can read more about the factors u need to consider for Pi network Mining and if its actually worth it?
https://www.cryptotapas.com/pi-network-is-gaining-traction-is-it-worth-mining/
https://www.cryptotapas.com/should-i-mine-pi-network-coin/