There's lots of cloud providers besides Amazon (including MS themselves).
There's several search engines besides Google (again including MS's Bing, plus DDG)
Apple isn't the only big handset maker. Samsung probably sells many more units which are arguably much better (they have much better screens for instance, plus SDcard slots). There's many, many more besides them too: Sony, Huawei, LG, etc, and countless models from each.
There's many options for payment besides ApplePay: Google has something, plus you can just use a regular debit or credit card or good ol' cash.
There's more than one app store: Apple has one and Google has one, and there's a few other non-Google Android ones too.
In all these cases, the alternatives aren't some tiny little niche player, they're huge. Apple sells a minority of smartphones today, though they make the most profit.
The big standout is OSes: good luck finding a job that doesn't force you to use Windows. If I want to avoid the big player in each of the other items in your list, it's pretty easy to do. I can easily go without ever using Google Search, or an iPhone, or ApplePay or the Apple app store. It's not that easy for me to avoid having to use Windows; that shuts me out of a LOT of jobs (almost all of them really). (Even worse if I want to avoid using either Windows or OSX. Good luck with that.)