Why would he move the money outside the UAE? I have to say I don't have experience with stuff like this (since I have always done everything 100% correctly - I would rather move than break any laws), but then just use a UAE-based broker to buy stocks, then sell the stocks? Then you have proof of funds - you made your money selling the stocks.
Or just buy an apartment in the UAE with crypto and sell it, then︀ you have proof of funds? Set up a company and pay yourself salary/dividends from that︁ company into your UAE bank account? The UAE is known not to be very strict︂ about this (that's why they are on the grey list). I can't imagine it would︃ be that hard.
People like Fred used to offer cashing out crypto as a service︄ even, he's hardly the only one.
Anyway, my main point was: Can't you just set︅ up a second residency and then use that for all your crypto stuff? Just avoiding︆ reporting? But I guess there will always be some risk that someone will report to︇ your residency country, so it's probably not a perfect solution.