Hmm. I'm not sure about that. The UAE knows very will that the reason why people is there is because of this 0% taxes, it's literally their bread and butter and they will make sure to defend that no matter what (this is not my words, these are the words of the people who are close to bin zayed and the royal families in the UAE)
Plus they make their money from other things, you have to pay 10+k Every year to have a decent setup in Dubai, so that's more or less "A fixed taxes" but it depends on how you look at it, and whether you have a small business or not.
and for the EU, If they wants to crack down on something, they should crack down on the next neighbor and I'm talking about
Monaco, and as far as I'm concerned, they didn't do anything to it, maybe the situation will change in the future, who knows? but for now Monaco is safe at least.
the most that the EU can do to the UAE is cracking down on pseudo residencies, and I'm here talking about the dumb fucks who get a residency in Dubai and spent the rest of the year in Europe or in their home country and expect the tax man to swallow this BS. these are the people who are the most likely to be targeted by the EU.
But for now, Dubai ticks a lot of the boxes for a lot of people, and as long as it remain that way, people will still chose it as their main hub whether it's for business, banking or general lifestyle.