I think the question should be "what services can I rendered to make 0.1btc par week" to earned 0.1btc is easy if you have any digital skills such as video or audio editing, forex trading, photoshop and website design. You may have the skills but you also need dedication and commitment to work things out.
The issue is there will be a time when there will be no demand for those services and in that case he will be jobless with no income as its hard to find those services on regular basis and it will not give him regular source of income so if he wants to earn that amount regularly then he can go for trading as trading is available 24/7.