join some signature campaign , but 0.1 per week is hard i think
even if you have lots of legendary account you cant still be able to reach that amount in just a signature campaign only because 0.1 per week is too big enough but i guess that is possible in trading, gambling and investing , only if you have to risk a verry big amount. if you have a special skills in developing or coding and some indemand jobs these days for sure you can always achieve that amount in a single week without spending any amount as a capital. but overall the real secret to reach that amount is dedication , hardwork and willingliness to take any risk.
Of course with the signature campaign, 0,1btc per week is impossible, especially in this time, the price of Bitcoin has become higher, Bitcoin from the signature campaign is also lower to match the price of bitcoin. However, we also should not because the income is not high without participating in the field, this is a pretty good job, it is simple and there is not much risk as other jobs, gambling is the work should be put in the black list, it does not fit. Investment and trading is the most appropriate, but we need to have some reasonable capital and skills to achieve this goal, this goal is really quite difficult
0.1 bitcoin is a big amount.It cannot be simply earned in a week or so.You need to give in your time and hardwork.It cannot be simply earned by joining signature camapaigns.You need to invest your money in order to earn more profits.People say gambling is profitable.But it is very risky and depends entirely on your luck.You can try bitcoin mining too in order to earn some money.You can also do trading with your bitcoins.If you have money then you can buy some bitcoins.If you already have them then you should hold them for future.