Not like I like the UAE (I don't), but during this war they made it plenty clear that it is illegal to record and share any videos or pictures of the damage that was caused by the Iranian attacks. Everyone in the country knows this, and I'm sure airlines have procedures to familiarize staff with the laws of the country they're flying to. If they don't, still not the UAE's problem. Don't like the law? Go somewhere else.

(inb4 any arm chair analyst decides this law is a bad law. That's not the point. The police only apply the law and not write it)

Secondly, I doubt this was some sort of high tech operation. More likely someone just snitched and/or some sort of meta data snooping.