Bitcoin does serve a useful purpose! It is perhaps not obvious to someone like you who don't seem to be a user. Or if you can't imagine how Bitcoin can help improve the world, you are probably only considering your little bubble, and not thinking about the other 7 billion human beings who are much less fortunate than you, economically, professionally, politically, financially.

Overall, Bitcoin reduces friction, enables transactions that would not otherwise take place, and protects people from losing their cash/savings in various situations. Here are just a few examples of problems of the existing financial system that Bitcoin solves:

- Credit card being denied while in a foreign country because the system accidentally tagged it as fraudulent

- Merchants unable to sell online and accept credit cards due to their market segment encountering high CC fraud

- Person unable to quickly and cheaply send remittance to family in foreign country

- Countries confiscating savings accounts of citizens (eg. Cyprus in 2014)

- Countries running their currency to the ground (Venezuela in 2017, Zimbabwe hyperinflation, USSR collapse, etc)

- DEA stealing innocent people carrying cash thanks to civil forfeiture laws (http://www.huffingtonpost.com/2015/05/07/dea-asset-forfeitur... http://priceonomics.com/how-police-officers-seize-cash-from-...)

- Bitcoin helping Chinese bypass GFW censorship (https://www.larrysalibra.com/hop-over-the-great-firewall-wit...)

- Paypal freezing for months the account of someone asking for donations for an expensive medical treatment (quite a few news stories about similar situations)

I could go on and on.