Startup Idea : Donate Work instead of money

Build an online platform where people can donate work instead of money. NGOs who are in need of technical help (like build a website, maintenance, bug fixes etc) can post their work on this platform and people willing to help them can donate few hours of work for them. Various benefits of this platform - NGOs who cannot afford to spend can benefit by this - NGOs who are not aware of online presence and its benefits - Donation satisfaction to people who donate work through this platform NGOs will need to provide certifications to validate that they are indeed a NGO before they are allowed to post work on this platform. Platform will not make any money for itself except show ads and earn money to run the platform itself.