With the signature campaigns this is already possible and you can do some trading or gambling without any doubts for that.
I recommend to do some signature campaigns because its way more safe than other methods nowadays.
To earn 0.1 btc only from signature campaign you need to have multiple account enrolled in multiple campaigns and then that amount can be earned easily on weekly basis.
That's possible, but it has the highest risk of getting kicked out from all the campaigns. It's better to have a single account and make yourself involved into other earning methods from faucets to trading. Surely you will make 0.1btc in a week.