It is not true with impacts of Bitcoin and it is more untrue with impacts of cryptocurrency (altcoins). From individual to national impacts, neither Bitcoin nor altcoins can extremely help poor nations.

If a country is poor, fall behind the world, there are many core problems there and governments are responsible to fix these issues. It's not responsibility of Bitcoin or cryptocurrency (altcoins) to fix these problems.

In investment view, investors can get profit and get loss and no evidence to say all or most investors in one country will get profit from their investments. But as said, problems are more systematic and related to governments so citizens can not fix these problems with their investments in Bitcoin or altcoins.

Altcoins can be attractive but they are very risky.
Don't buy altcoins because they are top altcoins