In 2008, there was a huge economic catastrophe in the world. Some banks conspired and deliberately caused this economic disaster. This is why many people were financially disadvantaged and lost their trust in the bank. I think Satoshi made bitcoin to save people from this disaster. That is, Satoshi has created a currency where there is no third party. There will be no central bank. No one can control it. Customer to customer transactions can be done. While Bitcoin has no controller, no one will be able to intentionally disrupt its finances. Bitcoin introduced a new horizon to the world's economy and freed people from this economic catastrophe.
So I think this is why Bitcoin was created. Is that the only reason? Or are there more reasons? What is your opinion?
The reason for the existence of bitcoin is quite simple to have a form of money that you can use without a middleman, however even if it was not the intention of satoshi his creation is going to weaken banks and the control they have over the economy as time passes and that is a good thing since they have grown too powerful over the last years and it does not seem like governments want to limit them and if anything they are helping them to become even stronger.