Tech2020 :
What if the banks start buying all the internet coins in the market (and they can ) and then control the internet currency as well ?
With crypto-currencies classed as assets, I think many investment banks already own some.
They can't buy
all, because that would be like buying
all the gold in the world. You'd run out of money, first. Even if you had enough money to buy it all at the beginning, the price would start to go up as you bought more.
And I still don't really see what this accomplishes. If someone bought enough bitcoin (for example) to destroy its liquidity, then people could just create another cryptocurrency that's similar (perhaps even forked from bitcoin's very codebase). Meanwhile, what does the bank gain? Banks don't really care which currency wins - it's the governments who care about that.
Tech2020 :
central banks controlling people money and economy.
Eh, central banks basically just control interest rates and inflation. Not to downplay those two factors, but there are more interesting government activities & policies that shape economies: budgets, taxation, subsidies, investments, social programs (health care, social security, unemployment insurance, welfare), business laws, trade policies, accounting rules, banking rules (leverage, risk exposure), etc.