Only downside is making it crypto/blockchain really narrows down your user base.
Here you are absolutely right. That is why even on the official website we dont say anything about the blockchain. The end user does not need to know this, it is even harmful. We are preparing a mass product, not an experiment for crypto-geeks. Just look at the cryptogame DAW (Daily Active Wallets) to make certain conclusions:
https://tokenized.games/top/