This might sound crazy but some people want the freedom to use their belongings however they want instead of having artificial child locks placed on them by trillion dollar corporate daddies.
I could answer "iOS may be shitty but it doesn't phone home every touch and your health data stays local". I really don't want to argue abour iOs vs Android. I used both. They are both shit made to lock their users in an ecosystem that solely benefits Google or Apple. I really couldnt care more about arguing which is worse, I would just want the market to allow something better than both for me, the user.