Because Google... I could live with not having iMessage or AirPlay, that's annoying but something I could live with. So it's either a de-googled Android phone or iPhone, and I do need a few apps which are only available in the App Store or Play Store, so I figure I'm limited to phones that can run something like CalyxOS, which basically limits me to Pixel or FairPhone.
The FairPhone isn't a terrible choice, but I'm not going to replace a functional iPhone with it... if it break maybe, or I can get a used iPhone.
It's not that I trust Apple all that much, I just trust them way more than Google at this point. I don't think Google is evil or bad, but their interest and mine doesn't really align.