I feel apple is huge mostly in the US, rest of the world apple has a reputation for being overpriced so people have mostly never used a Mac and if you have a lifetime of windows usage switching is jarring.. speaking from experience
Global desktop market share for macOS is 15.31% according to https://gs.statcounter.com/os-market-share/desktop/worldwide
It is well known for decades that a Mac user spends many times more on software for that Mac than a PC user spends for software, so it is reasonable to conclude that an iPhone user visits more web pages.