You can easily change your account region back and forth on iOS. Meanwhile Android has a bunch of extra checks and includes a 12 months delay before being able to switch it again.
Not if you have any balance or ongoing subscription, including an iCloud storage one. I would not exactly call this "easy".
On Android you can just have two accounts logged in at the same time, so there's no need to switch regions in the first place.
A family member lost years of irreplaceable photos and paid apps due to account lock, and doing this across two countries they were legitimately residing in triggered it.