I can hand you my (EU) account data and you can steal my games. Play Overwatch for free, in my name. Play the SC2 extensions I bought. YAY!
Now, I as the rightful owner of that account cannot add a purchase to that account, because "regions". I cannot switch regions, because that requires that I hand in the most personal information I have (address, ID) unless we're talking nudes. It feels like nudes.
You can steal my account and use it for a lot of nonsense and enjoy the paid content. You cannot move my account into a different region. Cool. Neither can I...
It's not clever, it's not "putting effort into it", it is blatantly speaking just stupid.
When I wanted to create a Hearthstone account, I found that out. The Blizzard CS reps were pretty decent, and they eventually fixed the issue (I still ended up creating a brand new account with better security since I was paying money this time).
It was stolen and I was getting emails in Russian (I think) but I didn't care (mostly because of things they do like this post) until last year when I wanted to play BF2:BC so I contacted EA's customer service thinking there's no way I could get the account back, especially after 4-5 years. They asked a couple of questions and got my account back in about 15 minutes.
I had my EA account stolen once. You know what they did? Nothing. I was able to trace the culprit's real name, his e-mail address, country of origin, and ISP via an IP address (which was not provided by EA, by the way ;-)). I did not even get a response from EA's customer service, except some drone sending me a password reset, which I did not need by then.
At least Blizzard puts some effort into it. And I can, without much trouble, get a human on the phone if I call Blizzard's customer service department.