Crypto is like metals but all is stored online. Now people say crypto is a currency, but that is wrong as you can not pay taxes with it in any country. Now a lot of people have seen crypto grow super high but it can be illegal. How? As people can do money laundering which means that you have 2 businesses.
1. a legal one (It is called laundering as it is usually a laundromat)
2. an illegal one.
So what they do is the mark the profit of the illegal ones on the legal ones so government does not arrest them. So with crypto you can do 2 things. One call profit of illegal one on the growth of bitcoin. Two say that it is all from my laundromat (like normal but it is harder to verify). So expect crypto to be banned in few years.