In my opinion, it is impossible for everyone to have their own currency. Currency is a medium of exchange for goods and services. In short, it's money, in the form of paper or coins, usually issued by a government and generally accepted at its face value as a method of payment. It should have value in order for you to use it in purchasing services and goods. For your coin to have value it must be recognized by the public. In cryptocurrency this will increase it's value through high demand. What does your coin do? What sets it apart from other coins?
Now there are already more than 9000 different types of cryptocurrency, and a significant part of them is useless, that is, it is not necessary and useful to people, and therefore is not in demand. Each cryptocurrency must fulfill some useful role, so the idea of each creating their own cryptocurrency is meaningless.