In principle, all kinds of trade are halal unless there’s an element of immorality or injustice in them. According to my knowledge of the financial markets, cryptocurrency trading doesn’t inherently have these two elements. That said, people gamble over many different kinds of halal activities – it doesn’t deem those activities as inherently haram.

According to Ghamidi sahab the prohibited aspect of a trade has to be gauged by the parties involved in the trade itself, or sometimes the state if the impact can be at the level of the society.

https://youtu.be/vVXQGwCQe-Y