I tried this "trick":
https://crypto-invest.io/en/freebitcoin-multiply-btc-trick-2/I have to say it definitly works, but i guess it is possible it can go wrong. For sure it can, i mean its gambling, it would be to easy if it works any time...
But now i have won nearly 0,05 BTC, and because it was completly for free i am fine with that.