It's not possible.
We are aware that in Islamic countries, the government is highly associated not just with political views but with regional views. Gambling is not allowed in these types of countries. There are operating illegally as usual and that was common.
And Dubai doesn't need the gambling industry to become one of their financial resources. They achieved being one of the richest places in the world without it.
Don't fall easily on any social media rumors, you have to confirm it first with the authority especially if you're living on a country where gambling is not legal. Some risk taker still gamble illegally, but I don't suggest this one better to be safe than to say sorry later on.
It's not about the gambling that could make them rich or help their economy, it is all about their religion, nothing more to that. Besides, gambling taxes doesn't make a certain country rich at all, they pay a huge tax but the taxes of citizens are still bigger than them of course, that's why the oil revenue is all they needed, no gambling stuff.
Maybe rich people in Dubai go somewhere else where gambling is legal if they really want to gamble because they don't know where to spend their money anymore.