A truly x-platform app is one that works well on all 5 of these platforms, e.g. Signal. A moderately x-platform app is one that works well on the two mobile operating systems and on web as an alternative to desktop, e.g. WhatsApp. A single-platform app, like Apple FindMy, only works properly on e.g. Mac + iPhone. Apple tends to be the only major industry player that produces these sorts of apps, e.g. iMessage, FaceTime, Final Cut Pro, Keynote. Although with Keynote you can often get by with the iCloud web version, which has a useful 80%-or-so of the desktop app's features. Even apps like Meet, Zoom, and Teams -- run by rival companies -- are more x-platform than major Apple apps.
Just to add to the different ways that that exact grouping of letters can be interpreted.
Maybe because I see an API as being able to be accessed from anywhere, so you could query it from a home automation device to trigger something when you are withing X meters of your house, which even if Apple truly released a cross-platform version of Find My that wouldn't be possible.
Xtian Xmas xfer tx/rx xor...
The argument wasn’t made out of principle, either. If it were more widespread, it would be worth the potential confusion. It’s just not. I agree with that.
That's not a huge portion of total market share but is still major by some measure.