I concur with what Koeshi said; Arabic is indeed a very broad term. Not only does the language have "Standard Arabic", but it also encompasses plenty of dialects. The Gulf region/Middle East alone has around 8 different dialects. While they have similarities in many linguistic aspects and are mutually intelligible there are substantial differences, much like how the UK/American/Australian English differ. We also have at least 4 Syriac dialects. The Arabic dialects in the African continent though differ greatly.
I suggest that Arabic dialect flags get uploaded upon request; in my case, I would definitely like a Kuwaiti flag. Wish I speak it well enough though *sniff*
About the entertainment industry: Egypt has the largest film productions, hence why much of the Arabic entertainment that non-Arabs know are spoken in Egyptian dialect. There are other Arab countries that produce entertainment including Syria, Saudi Arabia, and Kuwait, though they're not as known as Egypt's.