People that say that most likely have absolutely no idea how cryptocurrencies work. They are probably just echoing what some other uneducated person said. If they had any idea who our traditional money systems work, they would see that they are much worse than Bitcoin could ever be. Central banks just print out money from thin air. Then they hand it out to other banks with interest. There is literally no money to pay back the interest. The only way to pay back the interest is to borrow more money. It's a never-ending circle of ridiculousness.