Board Thread:Event Help/@comment-32048464-20171027121811/@comment-31426952-20171027123344

Not really, anyone can use free stones and get good units but it's still currency that's available for sale. People pay for stones so they have a better chance to get great units but someone who doesn't spend can get an even better team if they're lucky.

Technically F2P is no in-game currency used for gacha summons