It's not worth it though, you only get very VERY small amounts! Plus they aren't mining the crypto they are saying, they are mining Monero, and converting it to the crypto you choose to mine. Plus they are talking most of what yo earn mining, so it's better to just mine by yourself or join a pool.
RE: The easy way to mine Bitcoin, Bitcoin Cash, Litecoin, Dogecoin and Dash passively in your browser