I see a lot of coins like this which is scam, same scheme but different method. TBC(the billion coin) and Smash coin will be the best example that I can give.
I did not know about TBC and Smash coin, but I think the most representative similar scams are BitConnect and One Coin. Both stated they have a blockchain (and they didn't have any), that the coins will be mineable (which did not happen) and in the end they turned out as two of the biggest Ponzi schemes ever known. I remember that One Coin also had (has?) a site similar to a marketplace for this coin, but there was nothing to buy, maybe excepting some honey jars lol. The Bulgarian woman who invented One Coin dissappeared a few years ago, after Police started to look for her and her whereabouts are still unknown.
Pi is the same attempt of deceiving people and scam them. Beware!