https://cointelegraph.com/news/qatar-financial-centre-puts-blanket-ban-on-cryptocurrency-businesses
This is just for the time being, they will still come back to lift the ban. Some countries did this in the past and with time, they either soften the rule or lift the ban entirely.
The reason they out ban on crypto in GFC is a common problem that so many countries face. It is actually very easy to launder money with crypto and maybe to fund terrorism with crypto, but, before crypto came into existence and before its use as a means of transferring funds, some people have been laundering money without being caught and they have been funding terrorism without crypto. So what are we saying? I believe placing a ban on crypto is not the answer and with time they will get to know this.