Because it’s like platinum, or more accurately, the platinum of the Internet. As long as people trust that this currency has value, people will continue to invest in Franko. Franko is open-source software, so it has no central control with corrupt bankers and politicians, just really smart people working for free to keeping it running.
Given all the problems we see in world economies, people are rapidly beginning to lose faith in conventional legal tender like the EUR and USD. Governments have demonstrated that they can seize your bank-accessible assets if necessary. With Franko, this is not possible as they have no access to your funds. Your Franko wallet is essentially your own bank. It’s similar to the idea of people stuffing cash into their mattresses, except this is a lot more profitable and accessible. People will perhaps one day refer to this era as the gold rush of the 21st century.