Cryptotab is honestly not worth it, it pays you crumbs to put your device to mine, although it is a legitimate platform and it always pays, but there is no point in putting your phone to work to earn a few pennies, Cryptotab pays more or less 7 satoshis every 2 hours to free membership accounts.CryptoTab is an example of could mining right? I can remember when it was so popular and I was convinced to join it which I did. I even upgraded my account to earn more, in the end, I didn't get even $2 worth of Bitcoin from the rubbish.