Bitcoin was invented to disrupt "PayPal" because paypal was built on an idea of centralization which is not helping people from other countries. Yet, bitcoin has restored that very stolen idea of decentralization and freedom to the people. People are now using bitcoin all over the world because it's fast, secure, decentralized, and low fees in-terms of transferring value between two parties. Finally, but not least... Bitcoins has changed many people lives more than anything since the invention of the internet!
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There are many years still to come in this century, maybe we can see something bigger in coming years. But so far BTC is considered to be the biggest revolution after the industrial revolution of 1970s. Paypal doesn't work in every country, while BTC is a complete financial system that is open for every single person on this globe. This is what makes BTC unique and superior to all inventions so far.