Integration of products and support: - I or my wife take photos and videos with iPhone, we both have them available in a shared library, have them backed up to iCloud, can watch them easily on TV with Apple TV - when everyone is asleep, I can watch TV without disturbing anyone because I can easily c...

I agree with the other answers. I’ll just add one more reason: - Marketing 😅

Because I am a captured miserable slave. They own my soul and I can't break free.

Not listening to your friends bitch about green text messages.

For a few months I would have said AirDrop, but then I stumbled upon the FOSS LocalSend and I have spent less time on my iPhone ever since. Super easy to use and cross platforms too!

Airdrop, Calendar, Mail

Taxes. If we didn't pay Apple 30% tax on every transaction, who would build the roads?

synergy with other products in my family/home including apple tv, ipad and homepod. airpods work really well with iphone et al. security is pretty good without having to do much beyond keeping devices up-to-date.