Hey, really glad to hear you joined this platform, it's a great place to learn stuff and earn money. The app is a scam and I suspect they request access to you google account so they can sell information to 3rd parties. You can read about it in my final review: https://steemit.com/freebitcoin/@calatorulmiop/free-bitcoin-maker-app-review-finally-got-the-chance-to-try-to-withdraw-my-satoshi