How Bitcoin can be helpful in a social perspective?
If Bitcoin becomes a global reserve currency -- supplanting the USD in international settlements -- it could greatly improve the position of developing/exporting countries (the Global South). This is because USD monetary policy and the neoliberal international debt system are used to extract massive amounts of wealth from poor countries.
Consider the World Bank: It doesn’t lend money in domestic currency. It only lends USD, which is then used to buy US and European exports. This creates massive high-interest debts held by developing countries. So, eliminating USD hegemony would certainly level the playing field. It would end the implied incentive to purchase US exports over others and it would mitigate the debt bondage relationship.
And if Bitcoin or some other currency became a global reserve currency, it would also neuter the effect of US sanctions, which would help several poorer countries economically.
Any type of projects providing positive changes, in countries that needs the most?
The issues I laid out above concern global geopolitical and macroeconomic dynamics. No altcoin projects remotely address these issues, and anyone that claims they do are just scamming you.
The only solution is global market adoption of a decentralized currency (like BTC or something else) that can end US economic hegemony by displacing the USD as a reserve currency. It's not a matter of technology. It's a matter of adoption.