The money in your bank is just a ledger entry. Fiat isn't backed by gold reserves. Governments do provide some level of stability to it, but don't always succeed. Governments are free to print as much money as they like.
Bitcoin is a shared ledger that no single entity controls. The amount of bitcoin you own is tied to your wallet address, it is merely an entry in a shared database (blockchain) instead of your bank's database.
There is a limited supply of bitcoins. You can't just print bitcoin, you need to do a lot of work to "mine" bitcoin. Once 21 million bitcoins have been mined, no more will be created, by design.
There are of course scam currencies, OneCoin being the most notorious.
Regarding deserving the wealth, this is not different from speculating stocks or forex markets.
The work is in the 'mining' then?
So how does such 'mining' contribute to the world, pay people's salaries for the work they do, build dams and bridges, build houses, grow food and all the rest?
I get that there's a lot of corruption even with the current system, and speculation too, but the vast majority of money held by people around the world actually represents something, accumulated and worked-for wealth, from working and providing/doing things for other people who then paid you. Like the logical progression from bartering.
At the moment Bitcoin et al just seem bogus, you buy some Bitcoin and then 6mths later your money has gone up tenfold
.
I guess the idea is that eventually it will become 'real' and be used by everyone, but how long will that take?