Globalization has started long time ago and cryptocurrencies are just one part of it. Of course they help moving the boundaries because they can be used everywhere in the world where internet connection exists. They are definetely global phenomenon that gives to modern finances totaly different dimension.
About safety and security could be discussed, cryptocurrency have their bad sides like everything else and I wouldn't so easily say that cryptocurrencies are safer than fiat money. Hackers attack, money laundering different scams and abuse show that cryptocurrencies have their own soft belly too.
That is the most common disadvantage of cryptocurrency, hackers are hackers, they will do their best just to steal your money, they are so knowledgeable about doing that, they are really expert from stealing your personal information, so we should really protect our accounts from hackers and scammers in this virtual world, you may use different ways ti protect your account, you may use 2FA, use strong password, it is better if you add symbols on your passwords or add Capital letters on it, it will be hard for the hackers to access your account if you do that thing, do not believe some good offers from strangers, when they send you a link do not open it because it can be a scam, once you signed up then you may lose your money especially if you login your wallet information.