I believe this is often because of tax purposes. Dealing with international jurisdictions gets complicated and it may not be worth it to Stripe if they believe they can hire enough talent within NA.
It’s not that they couldn’t, it’s just that they don’t see the value in doing so.
If you’re looking for something with a few more features then I recently discovered https://appwrite.io
It includes database (Firestore), storage (Cloud Storage), users (Firebase Auth) and more, plus you can host it yourself. I haven’t used it myself yet but keeping a close eye on it.
It’s not that they couldn’t, it’s just that they don’t see the value in doing so.