Once Dubai signed the EXPO 2020 agreement in 2012, it was like a death wish for it's real estate sector.
They agreed to issue multiple entry visas (which they approved sometime in 2016), they agreed for international accounting practices (mandated under VAT laws), they agreed to implement VAT and other indirect taxes, they also agreed to share information on banking assets, real estate, visa entries etc (visa entries have been shared with Canada a few years ago) with any Govt under OECD data sharing agreement. All of this was agreed in order to get the EXPO 2020.
Data sharing by Dubai began in Jan 2017 after many years of warnings.
Russians, Britishers, Iranians, Qataris, Yemenis, Europeans, Americans, Syrians, Libyans, Bangladeshis, Canadians, Australians etc who all were big investors in Dubai have all mostly departed.