Fouz's husband is probably not a billionaire. Maybe a millionaire or just stingy idk there are rumors that Fouz uses fake diamonds and fake bags and rents expensive things to show off on camera. Anyway the biggest difference between Fouz and Rawan is that Rawan has no actual fans in Kuwait. Kuwaitis don't look up to Rawan nor do they try to emulate her. She is viewed as an embarrassment and out of touch with Kuwaiti trends and what's cool with the youth.
Fouz has a huge following among the upper class / upper middle class Kuwaiti girls. The ones from wealthy powerful families (like Al Sabah) and most of these girls don't wear the hijab. Style wise, they like Fouz's look. Fouz is the main reason these girls now put their pictures on Instagram. Before Fouz, it was considered a big taboo to put your picture on Instagram, Twitter, any public online website. These upper class girls don't wear hijab and dress Western but it was still considered a big taboo to them back in the late 2000s and early 2010s. Fouz broke many barriers and taboos so they genuinely look up to her and try to emulate her. None of the upper class and upper middle class Kuwaiti girls think Rawan bin Hussain is attractive, appealing, and worthy of being emulated. The only other person who has come close to Fouz's level is Laila Abdullah, the upper class Kuwaitis absolutely love her. Laila is a Lebanese who looks very Kuwaiti she lived in Kuwait her whole life, talks Kuwaiti, and dresses like the upper class Kuwaiti girls. They love her tan bronze color.
The "cool look" is tan, thin, and wearing certain designer brands. Rawan is more on the curvy side, they don't look up to her or try to emulate her body type, skin color, and clothing style. Rawan is just too irrelevant in Kuwait.