The main issue is, you can’t link a Taiwan bank account or paypal account to it. You can buy PSN codes and redeem them, though. I buy them from amazon and they’re delivered digitally. You just need to have your billing address set in the US.
The only features you can’t access are the video content (Playstation Video or Vue) and Playstation Now. Those are geo-blocked. A DNS used to work but not anymore. I’ve heard VPNs will work but I don’t feel it’s worth the hassle.
Playstation Now works by streaming the games. It’s funny, because I just got an XBOX and they have a Game Pass which lets you download the games and play them (as long as you’ve got an active subscription). So it basically works in every region with just a few differences in the games available. Plus the Games for Gold, there’s a lot there.