It's your opinion and I'm not trying to convince you otherwise. But many people just want to use their phone for casual day to day business (Facebook, insta, YouTube, you name it). Some of them simply cannot wrap their head around android or the whole concept of privacy and security on the internet, others just don't care because they don't know half of it. For those average users, and I do not mean that in any way to be disrespectful, iphones are a reasonable choice because they are reasonably secure, easy to setup and to use. They have no threat models, no state sponsored agency on their back which tries to infiltrate their devices to collect as much compromising data as possible. I know enough people who just want to use their phone, take pictures, message their friends and family and be done with it. That's how apple got so big, perfect marketing and easy to use devices. They just made their homework.
Everybody has different needs and expectations and iphones certainly cater to some of them.