But, if you don't want to work hard, the only choice for you are by trading or doing skill-based gambling (sportsbook or binary options).
In short, without actual skill, you won't earn 0.1BTC/week easily.
I am not sure that even with multiple accounts he can earn 0.1 btc per week as it is a big amount to earn per week. Now a days, we will have write quality posts to join a high paying signature campaign. Best thing would be to develop some special skills in designing, coding or in writing and market these skill and sell them to earn bitcoins.