If you’re talking about FaceTime and iMessage… They might technically not cost any money, but if I wanted to use them I’d first have to pay for an overpriced badly designed phone, which means they’re debatably free. They’re used to enrich the iPhone- just look at the whole blue/green text bubble thing. ‘If you don’t also have an iPhone you get treated differently’ hardly sounds like something a totally ‘free’ software would include. It just feeds into their ‘exclusivity’ bubble.