now a days there are many dice sites offering free bonus bitcoins that is the easiest way to get free bitcoins.
But are these actually bitcoins, that you can immediately withdraw? Or are they a "free roll" type deal, where you have to play through the bonus before withdraw? There is a big difference. Most free deals with play through are simply lost to the house -- that's why they do it.
No gambling site gives you free bitcoins that you can withdraw instantly. Withdrawal requirement is often 1 confirmed deposit, and the withdrawal fee is often higher than the free bitcoins you get.
There was a time...... 777coin used to give out .01 free and .001 free daily that could be instantly withdrawn. They still do a giveaway with no playthrough, but I think it is very small. Something like .0001 daily.