A Multi-billion dollar company can't operate an online store properly? A same company that operates a TV streaming service?
I didn't realise they also took down TV and Music for this. I must be wrong that streaming content can be duplicated in ways that an online store database (for a store that gives delivery times at point of sale, a function that requires stock levels to be known in real time) cannot.
Here are some articles about how Netflix operate streaming with caches. You'll find other streaming services do similar, and the internet is not quite as magical as you think.
https://openconnect.netflix.com/en_gb/
https://netflixtechblog.com/caching-for-a-global-netflix-7bcc457012f1
https://www.reddit.com/r/Piracy/comments/yee5ws
As someone who lived in China before iCloud servers were placed in China, I can tell you how big a difference local caches and bandwidth beyond your own internet connection make. I once uploaded 20 photos to iCloud in a week, went to HK for the weekend and uploaded 1000 overnight. Backups would regularly fail in the mainland, work like a dream in HK.
But try localising a sales database. I mean, you could - but you'd have to have a good handle on expected sales... how many would be happy to see a 6-8 week delivery estimate in their country and delivery tomorrow on the other side of the border? (note this does actually happen, with a little less extreme difference because of the multi-billion dollar company's tight stock control, with some products that are already shipped to local warehouses rather than coming from China. Once that stock is exhausted, though, at this point everyone joins the same queue from China. That sales/manufacture process, the lack of change to the practice of taking the store down, and Apple's multi-billion dollar value are not unconnected).