Sigh
More evidence that Microsoft have no idea what they are doing.

November 2015 They trumpeted that they were going to reduce your storage back to 5GB removing the camera roll bonus, and reducing the free tier from 15GB... unless you clicked a button.

Now they are dictating what you can store your stuff on. I know it's their service that they're offering and I don't have to use it but good grief, it's almost like they're doing a photobucket.

@Nic said:

This is on sale if you want NTFS for Mac: https://deals.macupdate.com/deal/15648?utm_source=macupdate&utm_medium=email&utm_campaign=paragon

That actually looks interesting. Thanks, @nic!