I am wondering how blockchain technology can be used for charity and to reduce poverty in the world..
Any ideas are welcome

Easy. Make a whitepaper about a blockchain for charity with its own token then start an ICO with the promise that all funds will be spent on development and marketing. Phase 2 would be to list your token and hype your project. Once the token is pumping, you do Phase 3. You and the holders of your token will sell everything lol.
There, you and the others are rich now. Poverty has been reduced.