So, I think bitcoin is totally legal in Islanic Shariah.
It should be legal in all aspects by default since Bitcoin itself isn't doing anything wrong. It's the ecosystem around Bitcoin that may not be considered halal in certain cases. It once again comes down to how people use or abuse Bitcoin, and this is something that not everyone seems to understand yet. Bitcoin itself is the purest form of freedom, everything basically that the current system can't provide people with.
I know plenty of muslims myself, and they all haven't even thought one second about Bitcoin being halal or not, and that's exactly how it should be. I very much doubt that this will have any significant impact in the future because of that; muslims have bought themselves into Bitcoin already, so what exactly is there to gain? If people talk about the wealthy Arabs, then I am sure they have done everything to get involved in crypto by proxy. Banks invest in crypto by proxy, wealthy individuals, perhaps central banks, etc. It almost seems like an ongoing proxy hype.