This is just because of lack of knowledge about this cryptocurrency, there is nothing haram in this, it's just their own view. I don't want to go in long discussion, but one thing is clear these ulemas are never been in favour of this latest technology they have done many things against common Muslims will, so please ignore this all and talk about better way of adoption about this crypto technology.
These ulema call Sir Sayyed Kafir and then adopt his all way of having the latest education and now following his footstep, but we are nearly 100 years behind those have good education from our forefathers. So please ignore these things and try to spread this in new generation for better and solid future.
I agree with you. These ulemas do not know about cryptocurrency so they call it haram. If it is haram, then gold will be haram.
The stock market will be haram as well. I think the stock market and cryptocurrency work almost the same way.
When the purchase order in a currency is high, the price goes up. Similarly, when a lot of people start buying shares of a company, its share price goes up.
What do the ulama say about this?