Hi! I tried using a free app for BTC Mining. It promised to give you free bitcoin, but like all the others I tried the app was a scam. Here is how I came to my conclusion.
I opened to accounts and did some mining on both accounts. Then I logged in as a guest and started over. I logged back in to both accounts only to find that the Bitcoin I mined was gone. Conclusion, if the app is not just a reason to get you to look at the author’s affiliate ads, and really mining coin, it is mining coin for the creator of the app.
Be careful people.