Well, paying money for consumer apps/services (besides games) has always seemed a bit more normalized in the iOS ecosystem, and I imagine it must be a _somewhat_ simpler interface than the lovecruftian monolith of windows-N

saying this as a Linux user, I've never owned an apple device in my life (nor do I want to)

AFAIK, you can't pay for Kagi in Apple ecosystem. Users of both platforms have to visit their web page.