I’m guessing that’s mainly because you’re not aware of all the things WhatsApp enables. You should look into it then compare how essential that is to the iPhone. The iPhone doesn’t even come close.
The fact remains, there were 18 years of Nokia before even the idea of the iPhone started to come together. It’s been 15 years and there are governments working to ensure Apple remains the only non-Android option.
Apple are where they are today due to the profit sharing on the App Store. Developers made a LOT of money and, as the devs were successful, that fed back into Apple’s success which helped Apple to iteratively improve the hardware that people wanted to buy, that made devs money, that made Apple money. It’s a cycle of success that governments want to short circuit. And, just like there were folks that couldn’t envision anything coming after Nokia, there are folks today that can’t envision anything coming after the iPhone. They see it as the pinnacle of the world’s technological achievement. I’m confident it’s not, I’m confident there are people out there that can do better. However, without any form of easily accessible application repository (which is neither easy nor cheap) and allowing a way to effectively monetize the same, they’re just continuing to increase the likelihood that Google and Apple maintain their dominance.
I’ve specifically mentioned “non-Android option” because I take into account its ad-driven nature. Any company NOT deriving their main source of funding from advertising will need to share the profit amongst the partners in order to thrive. Without that option, without the ability to drive their success from the success they create for others, few, if any, will even make the attempt.